The prevalence and socio-demographic risk factors of coexistence of stunting, wasting and underweight among children under five years in Bangladesh

DOI: https://doi.org/10.21203/rs.3.rs-234367/v1

Abstract

Background

Childhood malnutrition in all its forms is a significant public health challenge for developing countries like Bangladesh. There is a gap in knowledge of the coexistence of various forms of malnutrition among children under five years (under-5) in Bangladesh. This study aims (i) describe prevalence and risk factors for the coexistence of stunting, wasting and underweight among children under-5 in Bangladesh.

Methods

This study included 6,610 and 7,357 under-5 children from Bangladesh Demographic Health Surveys (BDHS) 2014 and 2017/18 respectively. Associations between coexistence stunting, wasting and underweight and socio-demographic factors were assessed by the Chi-square test and negative binomial regression.

Results

The prevalence of coexistence of stunting, wasting and underweight gradually declined from 5.2% in 2014 to 2.7% in 2017/18. Children of uneducated mothers ((Adjused incidence rate ratio (aIRR) 5.0, 95% CI 2.3, 11.0)); with low birth weights (aIRR 2.7, 95% CI 1.4, 5.1); children of age group 36–47 months (aIRR 2.5, 95% CI 1.5, 4.1); and children of underweight mothers (aIRR 1.9, 95% CI 1.4, 2.7) were the most important risk factors. However, maternal educational status was not associated with coexistence of stunting, wasting and underweight among children under-5 in 2014 whereas in 2017/18 it was the most influential risk factor. Moreover, watching television less than once a week increased the risk of coexistence of stunting, wasting and underweight by 54% (aIRR 1.54, 95% CI 1.0, 2.4).

Conclusions

one out of thirty-five under-5 children were identified to have coexistence of stunting, wasting and underweight in Bangladesh. The burden of malnutrition was disproportionate among uneducated mother, underweight mother, low birth weight and socio-economically poorest household. Our study indicates that there is a need for multi-level interventions from household level to societal level to reduce consequences of childhood malnutrition.

Background

Childhood malnutrition in all its forms is a significant public health challenge. Malnutrition, in all its forms contributing to more than half of global deaths among children under five years (under-5), with the majority in low- and middle-income countries [1]. The coexistence of three forms of malnutrition (i.e. stunting, wasting and underweight) is prevalent in 124 countries with 41 countries severely affected [2]. Bangladesh currently experiences high malnutrition rates among its under-5 population with 40% of children affected by one or more forms of malnutrition and attributing to over 50% of deaths in children under-5 [3, 4]. Critically, more than 30% of children under-5 suffer coexistence of multiple forms of malnutrition [5]. Children with the coexistence of stunting, wasting and underweight have a 12-fold elevated risk of mortality compared to children with only one dimension of malnutrition [6]. Further, the degree of cognitive impairment, impairments to thymic development, decreased peripheral lymphocyte count and increased susceptibility to infections are directly related to the severity and co-occurrence of multiple dimensions of malnutrition [7].

Although malnutrition rates in Bangladesh declined since the 1990s, progress to tackle all forms of malnutrition remains unacceptably slow [8]. Risk factors for single malnutrition indicators (i.e. stunting, wasting or underweight) are multifaced ranging from access to nutrients, socio-demographic factors, poverty, access to healthcare and geographical location [3, 9, 10, 11, 12]. However, determinants of coexistence of stunting, wasting and underweight is not previously explored particularly in Bangladesh to inform context-specific evidence-based prevention strategies. Therefore, this study aims to (i) identify the prevalence and risk factors for the coexistence of stunting, wasting and underweight among children under-5 in Bangladesh.

Methods

Data source

Data of non-institutional residing Bangladeshi adults from the Bangladesh Demographic Health Surveys (BDHS) 2014 and 2017/18 were used for this study. The BDHS collects health and nutritional indicators’ data using a standard questionnaire with 99% response rate on average. Details of the survey questionnaire, sample design, data collection procedure can be found in BDHS 2014 and 2017/18 [5,13].

The BDHSs surveys use two-stage stratified sampling techniques to select primary sampling units (PSUs) and households using probability proportional to their size and an equal probability systematic sampling technique, respectively [5,13]. The enumeration areas (clusters) were taken from the 2011 censuses compiled by the Bangladesh Bureau of Statistics and were considered as the PSUs [5,13]. Children born from January 2009 or later and aged under five years at the time of the survey were considered eligible for height and weight measurements. A total of 7,886 (BDHS 2014) and 8,759 (BDHS 2017/18) children met the eligibility criteria, and 6,610 (BDHS 2014) and 7,357 (BDHS 2017/18) children complete and credible anthropometric and socio-demographic data (Figure 1).

Outcome variables and operational definitions

The primary outcome was coexistence of stunting, wasting and underweight among under-5 children in Bangladesh. A child was considered to be stunted (short stature for age), wasted (dangerously thin) and underweight (underweight for age) if their height-for-age, weight-for-height, and weight-for-age indices were ≤ -2 standard deviations (SDs) of the World Health Organization (WHO) reference population median [14]. Stunting, a cumulative effect of chronic malnutrition indicates the failure to receive adequate nutrition over a long period. Wasting is a form of acute malnutrition resulting from poor dietary intake or frequent infections like diarrhea. Underweight is an indication of overall nutritional health and a composite index of stunting and wasting [15]. Implausible values while estimating child malnutrition was defined based on the WHO 2006 standards flag limits of unitless z-score: stunting: <-6 or >6; wasting: <-5 or >5; and underweight: <-6 or >5 [14]. A child is considered malnourished, if he/she is stunted, if he/she is wasted and if he/she is underweight. For each of the questions/indicators, responses were re-coded dichotomously: 1=malnourished (i.e. stunting, wasting and underweight) and 0 = normal. Thereafter, the responses of all three malnutrition indicators were added which resulted in a score ranging from 0 to 3. The scores were again recategorized as 0 for normal, 1 stands for children with single dimension of malnutrition (either stunting, wasting or underweight), 2 for children with co-occurrence of two forms malnutrition (i.e. either stunting and wasting, stunting and underweight or wasting and underweight) and 3 for children with coexistence of stunting, wasting and underweight.

Independent variables

A selection of socio-demographic variables or risk factors of interest were identified from relevant literature [3,4,8,]. The variables were mother’s education (no education, primary, secondary, higher); mother’s working status (currently not working, currently working); mother’s body mass index (underweight, normal, overweight); children’s age (0-11 month, 12-23 month, 24-35 month, 36-47 month, 48-59 month); sex of child (male, female); birth order (first, second, third, fourth and above); breastfeeding initiation (within 1 hour, after 1 hour); birth weight (normal/average, small, not weighted); watching television (not at all/do not know, less than once a week, at least once a week); wealth index (poorest, poorer, middle, richer, richest), place of residence (urban, rural).

In low income countries, babies are often born at home without proper measurement of birth weight. Actual weight at birth was reported for less than 50% cases [15]. Therefore, all DHS in developing countries retrospectively collect information on baby’s size at birth based on mother’s perception as proxy of birth weight by asking the question “was the newborn very large, larger than average, average, smaller than average or very small?” Approximately 75% mothers can correctly report their baby's size at birth, therefore mother’s recall is a valid proxy measure of birth weight [16,17,18]. The wealth index or socio-economic status was constructed using information about household assets that were collected in BDHSs. The data on household assets included ownership of durable goods (e.g. televisions and bicycles) and dwelling characteristics (e.g. source of drinking water, sanitation facilities, and construction materials). Principal component analysis was performed to assign individual household wealth scores. These weighted values were then summed and rescaled to range from 0-1, and each household was assigned into quintiles: the first quintile: poorest; the second quintile: poorer; the third quintile: middle class; the fourth quintile: richer and the fifth quintile: richest [5].

Statistical analysis

Descriptive statistics were used to describe socio-demographic characteristics. The prevalence of coexistence of stunting, wasting and underweight was estimated using Chi-square test. Prevalence estimates considered the complex survey design and sampling weights. In all analyses, the significance level was set at P<0.05 (2-tailed). Adjusted models were developed to analyze the appropriate binary value for the adverse nutritional outcome of children under-5 (i.e. coexistence of stunting, wasting and underweight). All independent variables except those were found insignificant in the bivariate analysis (Chi-square test) were simultaneously entered into the negative binomial regression models for adjustment. A negative binomial regression model was used due to unequal dispersion property, i.e. mean ≠ variance and for the occurrence of rare cases (<10%). The strength of associations was assessed using incidence rate ratios (IRR). 95% confidence intervals (CIs) were used for significance testing. All statistical analyses were performed using Stata version 14.2 and sample weighting based on the complex design of the BDHSs was considered.

Results

Approximately 15% mothers were uneducated, 25% mothers were currently working and 23% were underweight. Approximately 40% children had poor socio-economic status and 68% were living in a rural area. Approximately, 41% of children were aged less than 23 months and 52% were males (Table 1).

Prevalence of coexistence of stunting, wasting and underweight

For the survey year 2014, the prevalence of coexistence of stunting, wasting and underweight was 5% that declined to 3% in the survey year 2017/18 (Table 2). In both 2014 and 2017/18 surveys, the prevalence of malnutrition was high in children of underweight mothers (8% vs 6%), children of uneducated mothers (8% vs 5%), children with low birth weight (11% vs 4%), and from very poor families (8% vs 4%) (Table 2).

Risk factors

From 2014 survey, children from socio-economically poorest families ((adjusted IRR (aRR) 2.3, 95% CI 1.5, 3.8)); children of age group 36-47 months (aIRR 2.2, 95% CI 1.5, 3.3); with low birth weights (aIRR) 2.1, 95% CI 1.4, 3.1); and children of underweight mothers (aIRR 1.7, 95% CI 1.4, 2.2) had a high risk of coexistence of stunting, wasting and underweight (Table 3). On the other hand, the most influential risk factors of coexistence of stunting, wasting and underweight in the survey 2017/18 were children of uneducated mothers (aIRR 5.0, 95% CI 2.3, 11.0); with low birth weights (aIRR) 2.7, 95% CI 1.4, 5.1); children of age group 36-47 months (aIRR 2.5, 95% CI 1.5, 4.1); and children of underweight mothers (aIRR 1.9, 95% CI 1.4, 2.7) (Table 3).

Surprisingly, watching television less than once a week increased the risk of coexistence of stunting, wasting and underweight by 54% (aIRR 1.54, 95% CI 1.0, 2.4) among children than not exposed to this media (Table 3).

Discussion

One of the key findings of this study is approximately 3% children under-5 experience coexistence of stunting, wasting and underweight which can have a detrimental impact on their short- and long-term health. India reports a very high figure with approximately one in ten children under-5 reporting coexistence of stunting, wasting and underweight [19]. Compared to other poor-income countries like Malawi (2%) and Ethiopia (4%) [20, 21] the prevalence of coexistence of stunting, wasting and underweight is high in Bangladesh. Limited resources at the National Nutrition Services (NNS) in Bangladesh may result in limited coverage and quality of interventions. Frequent changes in leadership, coordination, capacity, and workload-related challenges faced by the NNS have hampered the implementation of nutrition interventions [22]. However, we observed the coexistence of stunting, wasting and underweight among children declined 2 percentage point in 2017/18 from 5% in 2014 indicating that current interventions might be effective. Therefore, leadership, stability and resources at the NNS can provide further coverage of high-quality interventions to further decrease the coexistence of malnutrition in children under-5.

In recent survey, we found the risk of coexistence of stunting, wasting and underweight increased by 402% in children of uneducated mothers which was insignificant in 2014 survey. Lack of maternal education was not assessed most influential risk factors of child malnutrition in previous studies in Bangladesh and other developing countries [8, 23, 24, 25]. Current evidence also showed that three out of fifty children of uneducated mothers were suffering from coexistence of stunting, wasting and underweight as children of underweighted mothers did. Parallel state of poor maternal educational and socio-economic status in households might affect children with critical nutritional hazard due to knowledge gap and inability to provide appropriate diet [26]. Low birth weight was a risk factor for the coexistence of stunting, wasting and underweight and our results concur with Ramakrishnan (2004) [27]. We found the relative risk of coexistence of three forms of malnutrition increased by 165% in children with low birth weight compared to normal weight. Children with low birth weight experience growth failure during early childhood which may increase the risk of long-term complications like diarrheal and lower respiratory infections, sleep apnea, jaundice, anemia, chronic lung disorders, fatigue and loss of appetite [28]. Children of older age group (36–47 months) had 2.5 times higher risk of coexistence of three forms of malnutrition than youngest children (less than 1 year). Das and Gulshan (2017) found older children had high risk of stunting ((odds ratio (OR): 1.5)) and lower risk of wasting in Bangladesh [29]. The current estimated risk of the coexistence of three forms of malnutrition among older children was higher compared to previous study finding. After second year of life, children in Bangladesh tend to have the same diet as the family, along with breast milk; although they are often allowed to eat food themselves, they do not always have access to adequate amounts of solid food, and this might contribute to their poor nutritional status [30]. Also, the coexistence of three forms of malnutrition increased by 95% for those born to underweight mothers. Likely because mothers are underweight due to food insecurity, poverty and micronutrient deficiencies [31]. Poorer socio-economic status [3] is another risk factor contributes coexistence of stunting, wasting and underweight and our findings concur demonstrating the complex nature of this public health issue. Investing in maternal and child healthcare system, increased participation of underprivileged people in income generating activities can improve the nutritional status of children. Further, improving women’s education can contribute towards increasing family income, access to a better quality of diet consequently improving children’s health [32]. Increasing education opportunities for females, especially in rural areas is recommended [8].

Surprisingly, watching television less than once a week increased the risk of coexistence of stunting, wasting and underweight by 54% among children than households not exposed to this media. This finding was not consistent with a study conducted in Bangladesh [8, 33]. Inconsistent contents of food advertisements regarding dietary recommendations and poorer understanding of nutrition from food advertisements in television might cause adverse nutritional outcomes, indicating need of attention of the policy makers to the matter [34, 35].

Use of multiple nationally representative household survey data points with a high response rate was a strength of this study. The survey questions were validated and established. Although suitable statistical tools like Negative Binomial Regression was used to assess the risk factors, the cross-sectional nature of the data was not sufficient to establish a causal relationship between risk factors and the dependent variables. Further, data on potential confounders like diet, food insecurity and parents smoking behavior were unavailable. The BDHS data were collected retrospectively and self-reported, underreporting, information bias, recall bias might be possible.

Conclusion

The burden of malnutrition among children under five years in Bangladesh was disproportionate among children of mother with no education, children with low birth weight, children of older age group (36–47 months), children of underweight mothers, and socio-economically poorest families. Our study will provide helpful guidelines for intervention development from household level to societal level to reduce short- and long-term health consequences of childhood malnutrition. Level of mother’s education, underweight mother, low birthweight, and poorest socio-economic status should be the focus of evidence-based interventions. Effective and systematic coordination of the implementation of interventions requires between different nutritional programs and policies to support such strategies.

Abbreviations

BDHS: Bangladesh Demographic Health Survey, BMI: Body Mass Index, CI: Confidence Interval, IRR: Incidence Rate Ratio, NNS: National Nutrition Services, PSU: Primary Sampling Units, WHO: World Health Organization.

Declarations

Acknowledgement: Not Applicable.

Ethics approval and consent to participate:

Since this study was based on secondary analysis of the data obtained from Bangladesh Demographic and Health Survey (BDHSs), 2007-2018, no ethical approval was needed for this study. The BDHS surveys were reviewed and approved by the ICF Macro Institutional Review Board (USA) and complies with all the requirements of 45 CFR 46 - “Protection of Human Subjects”. The BDHS was also reviewed and approved by the National Research Ethics Committee of the Bangladesh Medical Research Council (Dhaka, Bangladesh). The survey ensured international ethical standards of confidentiality, anonymity, and informed consent. However, request to access datasets from measure DHS website is made, and the websites has allowed the same before analyses is made.

Consent for publication: Not applicable.

Availability of data and materials: The data underlying the results presented in the study are publicly accessible and available from DHS website (https://dhsprogram.com/data/available-datasets.cfm). Name of the dataset is Bangladesh Demographic and Health Survey (BDHS).

Competing interests: The authors declare that they have no competing interests.

Funding: This research received no specific grant from any institutions.

Authors’ contributions: MRKC conceptualized the basic idea for the study, performed the statistical analysis together with MSR and RK. MRKC and MK prepared data for analysis and the first draft of the manuscript. BB and NKPP critically revised the manuscript for intellectual content. All authors have reviewed and approved the final manuscript.

Author details:

1 College of Nursing, Midwifery and Healthcare, University of West London, London, UK

2 Research Center for Child Mental Development, Hamamatsu University School of Medicine,

Japan

3 Department of Epidemiology and Preventive Medicine, School of Public Health and

Preventive Medicine, Monash University, Melbourne, Australia

4 School of Allied Health, Faculty of Health, Education, Medicine and Social Care, Anglia Ruskin University, Chelmsford, UK

5 Nuffield Department of Orthopaedics, Rheumatology, and Musculoskeletal Sciences,

University of Oxford, UK

6 Unit of Physiotherapy, Department of Health, Medicine and Caring Sciences (HMV),

Linköping University, Linköping, Sweden

7 Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden

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Tables

Table 1 Background characteristics of the children

Factors

Survey year 2014

Survey year 2017/2018

 

Frequency

(%)

Frequency

(%)

Mother’s education

 

 

 

 

No education

1,010

15.3

521

7.1

Primary

1,823

27.6

2,098

28.5

Secondary

3,067

46.4

3,498

47.5

Higher

710

10.7

1,240

16.9

Mother’s working status

 

 

 

 

Currently not working

4,937

74.7

4,375

59.5

Currently working

1,673

25.3

2,982

40.5

Mother’s BMI

 

 

 

 

Underweight

1,506

22.8

1,108

15.0

Normal

3,825

57.9

4,339

59.0

Overweight

1,279

19.3

1,910

26.0

Children’s age (in month)

 

 

 

 

0-11

1,335

20.2

1,694

23.1

12-23

1,392

21.1

1,525

20.7

24-35

1,334

20.2

1,404

19.1

36-47

1,280

19.4

1,311

17.8

48-59

1,269

19.2

1,423

19.3

Sex of child

 

 

 

 

Male

3,413

51.6

3,858

52.4

Female

3,197

48.4

3,499

47.6

Birth order

 

 

 

 

First

2,525

38.2

2,727

37.1

Second

1,998

30.2

2,431

33.0

Third

1,057

16.0

1,261

17.1

Fourth and above

1,030

15.6

938

12.8

Breastfeeding initiation

 

 

 

 

Within 1 hour

1,990

30.1

2,683

36.5

After 1 hour

4,620

69.9

4,674

63.5

Size of child at birth A, B

 

 

 

 

Normal/average

3,812

93.9

1,784

38.6

Small

248

6.1

325

7.0

Not weighted

 

 

2,518

54.4

Television watching

 

 

 

 

Not at all/do not know

2,707

40.9

2,783

37.8

Less than once a week

598

9.1

658

9.0

At least once a week

3,305

50.0

3,916

53.2

Wealth index C

 

 

 

 

Poorest

1,417

21.4

1,621

22.0

Poorer

1,231

18.6

1,476

20.1

Middle

1,308

19.8

1,325

18.0

Richer

1,366

20.7

1,479

20.1

Richest

1,288

19.5

1,456

19.8

Place of residence

 

 

 

 

Urban

2,107

31.9

2,520

34.3

Rural

4,503

68.1

4,837

65.7

Total

6,610

100.0

7,357

100.0

A, n=4,060 in BDHS 2014 and n=4,627 in BDHS 2017/18

B, children less than 2500g are small

C, an aggregated index based on household assets

Table 2 Prevalence of coexistence of stunting, wasting and underweight among children under-5

Factors

Survey year 2014

Survey year 2017/18

Number 

Prevalence (95% CI)

P values

Number

Prevalence (95% CI)

P values

Mother’s education

 

 

 

 

 

 

No education

84

7.8 (5.9, 10.2)

0.0007

28

5.0 (3.3, 7.4)

<0.001

Primary

120

5.6 (4.4, 7.0)

 

73

3.6 (2.8, 4.6)

 

Secondary

143

4.5 (3.7, 5.5)

 

96

2.6 (2.1, 3.2)

 

Higher

21

3.1 (1.9, 5.1)

 

9

0.7 (0.4, 1.5)

 

Mother’s working status

 

 

 

 

 

 

Currently not working

246

4.6 (3.9, 5.4)

0.001

106

2.3 (1.9, 2.9)

0.012

Currently working

122

7.0 (5.5, 8.9)

 

100

3.3 (2.7, 4.1)

 

Mother’s BMI

 

 

 

 

 

 

Underweight

144

8.4 (6.8, 10.4)

<0.001

62

5.8 (4.5, 7.6)

<0.001

Normal

190

5.0 (4.1, 6.0)

 

112

2.5 (2.0, 3.0)

 

Overweight

34

2.2 (1.5, 3.2)

 

32

1.7 (1.1, 2.5)

 

Children’s age (in month)

 

 

 

 

 

 

0-11

40

2.8 (2.0, 4.1)

0.003

42

3.0 (2.2, 4.1)

0.009

12-23

91

6.1 (4.6, 8.1)

 

47

3.1 (2.3, 4.3)

 

24-35

72

5.1 (3.9, 6.7)

 

47

3.5 (2.6, 4.8)

 

36-47

87

6.2 (4.9, 7.9)

 

46

2.9 (2.2, 4.0)

 

48-59

78

5.8 (4.4, 7.6)

 

24.

1.4 (0.9, 2.2)

 

Sex of child

 

 

 

 

 

 

Male

206

5.3 (4.4, 6.4)

0.748

117

3.0 (2.5, 3.6)

0.199

Female

162

5.1 (4.2, 6.1)

 

89

2.5 (1.9, 3.1)

 

Birth order

 

 

 

 

 

 

First

123

4.4 (3.5, 5.6)

0.018

38

3.6 (2.5, 5.2)

0.313

Second

96

4.8 (3.7, 6.2)

 

31

2.5 (1.7, 3.6)

 

Third

67

5.7 (4.2, 7.5)

 

61

2.4 (1.9, 3.1)

 

Fourth and above

82

7.5 (5.7, 9.7)

 

76

2.8 (2.2, 3.7)

 

Breastfeeding initiation

 

 

 

 

 

 

Within 1 hour

112

5.6 (4.3, 7.2)

0.459

132

2.7 (2.3, 3.2)

0.741

After 1 hour

256

5.0 (4.3, 5.9)

 

74

2.8 (2.2, 3.6)

 

Size of child at birth A

 

 

 

 

 

 

Normal/average

174

4.3 (3.5, 5.2)

0.0001

26

1.5 (1.0, 2.3)

0.002

Small

29

10.8 (6.9, 16.5)

 

14

4.1 (2.3, 7.4)

 

Not weighted

 

 

 

77

3.1 (2.4, 3.9)

 

Television watching

 

 

 

 

 

 

Not at all/do not know

191

6.6 (5.4, 8.0)

0.001

88

3.0 (2.4, 3.7)

0.006

Less than once a week

34

4.8 (3.2, 7.2)

 

29

4.5 (3.0, 6.5)

 

At least once a week

143

4.1 (3.4, 5.0)

 

89

2.3 (1.8, 2.9)

 

Wealth index B

 

 

 

 

 

 

Poorest

132

8.3 (6.8, 10.2)

<0.001

61

4.0 (3.1 ,5.1)

0.0003

Poorer

82

6.2 (4.7, 8.1)

 

53

3.2 (2.4, 4.3)

 

Middle

62

3.8 (2.8, 5.3)

 

42

2.9 (2.1, 4.0)

 

Richer

58

4.3 (3.2, 5.8)

 

32

2.2 (1.5, 3.3)

 

Richest

34

2.9 (2.0, 4.2)

 

18

1.1 (0.7, 1.9)

 

Place of residence

 

 

 

 

 

 

Urban

95

4.5 (3.5, 5.8)

0.238

62

2.4 (1.9, 3.1)

0.293

Rural

273

5.4 (4.6, 6.5)

 

144

2.9 (2.4, 3.4)

 

Total

368

5.2 (4.5, 6.0)

 

206

2.7 (2.4, 3.2)

 

A, children less than 2500g are small

B, an aggregated index based on household assets

Table 3 Risk factors of coexistence of stunting, wasting and underweight among children under-5

Factors

Survey year 2014

Survey year 2017/18

 

Adjusted IRR (95% CI)

P values

Adjusted IRR (95% CI)

P values

Mother’s education A

 

 

 

 

No education

1.25 (0.73, 2.15)

0.424

5.02 (2.29, 11.03)

<0.001

Primary

1.17 (0.70, 1.94)

0.548

3.32 (1.61, 6.85)

0.001

Secondary

1.11 (0.69, 1.79)

0.664

2.97 (1.48, 5.98)

0.002

Higher

1.00

 

1.00

 

Mother’s working status A

 

 

 

 

Currently not working

1.00

 

1.00

 

Currently working

1.29 (1.03, 1.61)

0.025

1.12 (0.84, 1.48)

0.446

Mother’s BMI A

 

 

 

 

Underweight

1.73 (1.38, 2.16)

<0.001

1.95 (1.42, 2.67)

<0.001

Normal

1.00

 

1.00

 

Overweight

0.65 (0.44, 0.94)

0.023

0.75 (0.50, 1.12)

0.162

Children’s age (in month) A

 

 

 

 

0-11

1.00

 

1.00

 

12-23

2.05 (1.42, 2.98)

<0.001

2.01 (1.22, 3.29)

0.006

24-35

1.74 (1.18, 2.56)

0.005

2.36 (1.44, 3.86)

0.001

36-47

2.24 (1.54, 3.27)

<0.001

2.46 (1.50, 4.05)

0.000

48-59

1.95 (1.33, 2.87)

0.001

2.03 (1.22, 3.37)

0.006

Birth order A

 

 

 

 

First

1.00

 

 

 

Second

0.98 (0.75, 1.29)

0.892

 

 

Third

1.17 (0.86, 1.59)

0.317

 

 

Fourth and above

1.25 (0.91, 1.71)

0.160

 

 

Size of child at birth B, C

 

 

 

 

Normal/average

1.00

 

1.00

 

Small

2.19 (1.48, 3.27)

<0.001

2.65 (1.38, 5.10)

0.004

Not weighted

 

 

 

 

Television watching A

 

 

 

 

Not at all/do not know

1.00

 

1.00

 

Less than once a week

1.03 (0.71, 1.50)

0.875

1.54 (1.00, 2.36)

0.049

At least once a week

1.13 (0.85, 1.49)

0.400

1.05 (0.75, 1.48)

0.778

Wealth index A, D

 

 

 

 

Poorest

2.35 (1.47, 3.75)

<0.001

1.25 (0.69, 2.26)

0.462

Poorer

1.90 (1.20, 3.02)

0.007

1.63 (1.10, 2.41)

0.047

Middle

1.41 (0.90, 2.21)

0.129

1.57 (0.87, 2.84)

0.130

Richer

1.32 (0.85, 2.05)

0.215

1.49 (0.81, 2.77)

0.203

Richest

1.00

 

1.00

 

A, adjusting all variables including child age and sex in the regression analysis except size of child at birth

B, simultaneously adjusting all variables including child age and sex in the regression analysis

C, children less than 2500g are small

D, an aggregated index based on household assets