This study revealed that Sri Lankan children with overweight and obesity had an overall PedsQL QoL score of 80.4, with lower physical QoL (78.1) compared to psychosocial QoL (81.7). Parents’ perception of children’s QoL was lower but correlated positively with child reported QoL. QoL of children who were overweight and obese was adversely affected by increasing degree of obesity, being bullied, lack of adequate exercise, and problems in obtaining appropriately fitting clothes.
Overall QoL reported by children with overweight and obesity in this study appeared to be lower than original QoL scores described by Varni et al. [16] for similar aged healthy children in United States (83.0), but higher than scores described for acutely and chronically ill children (78.7 and 77.2 respectively), with the same pattern observed for psychosocial QoL. However, physical QoL in our study population appeared to be lower than that of acutely ill children as well as healthy children. A Sri Lankan study [20] which assessed QoL using PedsQL™ in Sri Lankan children with asthma and healthy controls aged 12–14 years, reported higher mean QoL scores for overall (87.2), physical (88.7) and psychosocial (86.3) QoL in healthy children, compared to our observations of QoL in overweight/obese Sri Lankan children aged 8–12 years. Compared to children with asthma, however, overall and psychosocial QoL of our study participants appeared to be higher while physical QoL of our study participants was lower [20]. Therefore, Sri Lankan overweight/obese children appear to be having lower QoL in relation to healthy children. Further, they had greater compromise in physical QoL, perhaps exceeding those faced by children with asthma and acute illnesses.
In comparison to findings of QoL studies using PedsQL™ in children with overweight/obesity elsewhere in the world, Sri Lankan overweight/obese children in this study, appeared to have higher psychosocial QoL, while overall QoL was similar. Mean/median overall QoL in obese children ranged from 65.2 to 81.1 in other studies, as compared to a median of 78.3 in our study, while for overweight children, mean/median overall QoL ranged from 79.7 to 82.9 in other studies, and was 83.7 in our study [13, 21–26]. Although our study population reported a lower physical QoL score compared to psychosocial QoL, the opposite was observed in previous studies (physical QoL 67.2 to 88.4, psychosocial QoL 62.5 to 79.9) [13, 21–23, 25, 26].
Many studies, including our study demonstrated that parents of overweight/obese children often appear to perceive their children’s overall QoL to be lower than reported by children themselves, albeit with good positive correlation between the two [11, 12, 24]. One reason that is postulated is that parents could be more conscious of long-term negative consequences of obesity in their children, while the children themselves, may have a more short-term view, and thus, a more positive outlook [27]. However, while several studies showed better agreement between child-reported and parent-reported QoL on physical and school functioning [22, 28], parents in our study reported significantly lower perception of QoL in physical and school functioning, compared to children themselves. In many South Asian countries, parents often consider school education as a major factor enabling social mobility for the whole family [14]. The lower perception of QoL by parents of overweight/obese children in physical and school functioning in our study, may perhaps reflect increased expectation of South Asian parents for high performance at school in both athletic and academic fields, exceeding children’s’ expectations. Further, parents may not be aware of the ability of their children to achieve academic/educational competence despite being in disadvantaged circumstances (educational resilience) [14].
Research on social factors associated with impaired QoL in children with overweight/obesity is important to gain a deeper insight into the issue, and to identify new approaches to improve QoL [11, 15]. Previous studies have shown peer-victimization to be associated with lower QoL in overweight/obese children [11, 29]. In our study, similarly, being bullied exerted a negative impact on emotional, social, school functioning, and overall QoL, underlying the importance of measures to reduce obesity-related bullying to improve the wellbeing of these children. Better classroom support, encouraging peers to give better support, and increasing coping skills of overweight/obese children could be helpful strategies [30–32].
We have shown that QoL in children getting adequate exercise was associated with better psychosocial QoL, including social and school functioning. A previous study has similarly reported lower psychosocial QoL in less physically-active overweight children [33]. Therefore, promoting exercise among overweight/obese children appears important, not only for weight management and metabolic health, but also for improving psychosocial wellbeing.
In this study, we studied associations between QoL in overweight/obese children with some novel social factors such as: difficulty in finding/ fitting in to age-appropriate clothes; being on diet control; and having overweight/obese siblings or friends; which have not been reported before. Interestingly, we found overall QoL, and all subcomponents of QoL to be lower in overweight and obese children who had difficulties in finding suitable clothes. This finding is further supported by a previous study showing that buying clothes was an activity that obese children disliked [30]. This is a less well recognized factor that, perhaps, could be addressed by highlighting this issue to stakeholders in the clothing industry in the locality, to help ally a common problem faced by overweight/obese children in everyday life, which is impairing their QoL.
Associations of QoL of overweight/obese children with gender and degree of obesity have been studied by previous research in other parts of the world. Previous studies have shown controversial results on gender-based difference in QoL of overweight and obese children, with some studies reporting a higher QoL in boys than girls [11, 12] while some have reported similar QoL between the genders [13, 26]. Our study findings collude with the latter. A decrease in QoL with increasing degree of obesity has been well described [23, 24]. Further, previous studies have shown a strong to moderate negative relationship between QoL and increasing degree of obesity mainly in physical and social functioning, while emotional and school functioning remain relatively less affected [12, 23, 24, 34]. Similarly in physical and social functioning, we have shown QoL to be lower in obese compared to overweight children and a significant decline with increasing BMI, while emotional and school functioning did not show a significant difference. Programs for management of children with obesity, should therefore, try to understand and enhance the resilience of these children in emotional and school functioning, in addition to focusing on improving physical and social wellbeing in these children [14, 24].
Generalization of results
Our study sample included families from the three main ethnic groups (Sinhalese, Tamil and Muslim), and four main religions (Buddhist, Catholic, Hindu and Islam) in Sri Lanka. Further, as the study setting was a tertiary care referral centre, children residing throughout Sri Lanka were included. Thus, we believe that these study finding are generally applicable to all Sri Lankan children with overweight/obesity. It should be noted, however, that this study was conducted in a clinical setting rather than a community setting. A few studies have compared QoL in overweight/obese children between community and treatment-seeking settings, with some showing no difference in QoL assessments between hospital-based versus community settings [24], while others have shown lower QoL in clinical settings [11]. Thus, repeating this study in a community setting could result in similar or higher QoL scores.
Strengths of this study include using a pre-validated, international generic QoL questionnaire, using stringent translation procedure as outlined. It enabled us to obtain QoL results which are acceptable, and comparable with children from other regions and other conditions, to obtain a more in- depth appreciation of the impact of overweight/ obesity on QoL of children in Sri Lanka. Further, this questionnaire is available, with permission from the copyright owners, for future studies on QoL in Sri Lankan children, which would help further reduce research gaps in this area. Inclusion of a control group of healthy children would provide useful information in future research.