The results of the Schapiro-Wilk test confirmed the normality of the data (p > 0.05). The results of independent t-test showed that there was no significant difference between girls and boys for age (F (1, 101) = 2.24, p = 0.15, t = 1.43 ), weight (F (1, 101) = 2.02, p = 0.64, t = 0.46), height (F (1, 101) = 1.75, p = 0.15, t = 1.44), AHEMD total scores (F (1, 101) = 6.74, p = 0.47, t = -0.72), fine-motor scores (ASQ)(FM) (F (1, 101) = 0.15, p = 0.44, t = -0.76), and gross-motor scores (ASQ)(GM) (F (1, 101) = 3.69, p = 0.58, t = -0.55). Therefore, the results of girls and boys were merged and analyzed as one value (Cadoret et al., 2018).
Total AHEMD Score Comparisons
For total AHEMD scores, results of the one-way ANOVA test indicated that there is no significant difference between age (F (2, 100) = 1.18, p = 0.14, ηp2 = 0.03), height (F (2, 100) = 1.49, p = 0.57, ηp2 = 0.01), and weight (F (2, 100) = 0.39, p = 0.67, ηp2 = 0.008) of participants in Group 1, 2 and 3. Table 2 provides mean score results for the three AHEMD groups.
Table 2
Means and standard deviations for fine- and gross motor skills based on AHEMD groups
Variables | Group 1 (mean ± SD) n = 42 | Group 2 (mean ± SD) n = 22 | Group 3 (mean ± SD) n = 39 | Total (mean ± SD) N = 103 |
FM | 17.61 ± 11.75 | 25 ± 7.07 | 35 ± 16.05 | 25.77 ± 14.89 |
GM | 17.85 ± 10.82 | 25.45 ± 8.71 | 34.1 ± 18.56 | 25.63 ± 15.6 |
Insert Table 2 near here
Regarding income status, results of the one-way ANOVA test showed that there was a significant difference between the groups for total AHEMD score (F (2, 100) = 16.35, p = 0.00, ηp2 = 0.24), FM (F (2, 100) = 4.82, p = 0.01, ηp2 = 0.08), and GM (F (2, 100) = 6.05, p = 0.003, ηp2 = 0.1). About the three family income groups, children of families with higher financial status had greater total AHEMD scores than the middle- and lower-income groups (p = 0.004 and p = 0.00 respectively). In addition, the middle group had higher scores than the lower group (p = 0.001).
For there was no significant difference between the low and middle groups in FM (p = 0.29), and GM scores (p = 0.22). However, there was a significant difference between the high and low groups in FM (p = 0.003) and GM (p = 0.001), and between the high and middle groups in FM (p = 0.027) and GM (p = 0.014).
Based on the father's education level, there was no significant difference between AHEMD groups (low, middle, and high) (F (2, 100) = 0.99, p = 0.37, ηp2 = 0.02), and no difference between groups for FM (F (2, 100) = 0.13, p = 0.87, ηp2 = 0.003) and GM scores (F (2, 100) = 2.02, p = 0.13, ηp2 = 0.13). However, based on mothers education, there was a significant difference in total AHEMD (F (2, 100) = 42.34, p = 0.00, ηp2 = 0.45), FM (F (2, 100) = 8.69, p = 0.00, ηp2 = 0.14) and GM scores (F (2, 100) = 6.13, p = 0.003, ηp2 = 0.1). According to the LSD results, the scores of the highest education group were significantly higher than the other two groups in total AHEMD, FM, and GM (p < 0.05). The middle group was also higher than the low group for the same variables (p < 0.05).
AHEMD Item Scores and ASQ-3 Characteristics
Based on AHEMD groupings, one-way ANOVA results showed that with FM (F (2, 100) = 18.55, p = 0.00, ηp2 = 0.27), and GM (F (2, 100) = 13.69, p = 0.00, ηp2 = 0.21), there was a significant difference between the three groups. LSD post hoc test showed that in both FM and GM, Group 3 was significantly higher (see Table 3 and Fig. 1) than Groups 1 and 2; Group 2 exhibited significantly higher scores than Group 1.
Table 3
LSD test results for AHEMD group differences.
| AHEMD (I) | AHEMD (J) | Mean Difference (I-J) | SD | p value |
FM | 1 | 2 | -7.38* | 3.38 | 0.03 |
| 1 | 3 | -17.38* | 2.85 | 0.000 |
| 2 | 3 | -10* | 3.42 | 0.004 |
GM | 1 | 2 | -7.59* | 3.67 | 0.04 |
| 1 | 3 | -16.24* | 3.1 | 0.00 |
| 2 | 3 | -8.64* | 3.72 | 0.00 |
* Significant at the 0.05 level. |
Insert Table 3 near here
Insert Fig. 1 near here
As shown in Table 4, the correlation between the total and subtest score of the AHEMD with FM and GM (ASQ) was high and significant, with the highest association being the total AHEMD score with FM (r = 0.51).
Table 4
The results of correlation matrix between under study variables.
AHEMD | FM (ASQ) | GM (ASQ) |
OS | 0.48** | 0.44** |
IS | 0.41** | 0.37** |
VS | 0.44** | 0.33** |
FMT | 0.49** | 0.45** |
GMT | 0.47** | 0.44** |
Total Score | 0.51** | 0.43** |
** Correlation is significant at the 0.01 level (2-tailed). |
1. Valadi, S.; Gabbard, C.; Arabameri, E.; Kashi, A.; Ghasemi, A. Psychometric properties of the Affordances in the Home Environment for Motor Development inventory for use with Iranian children aged 18–42 months. Infant Behav. Dev. 2018, 50, 1–11. |
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In this study, simple linear regression was used to predict the level of AHEMD scores on FM and GM. Results indicated that total AHEMD predicted 51% of FM ability and 43% of GM behavior. In addition, total AHEMD score predicted 25% of FM (F = 36.72, p = 0.00, Durbin Watson = 1.85) and 17% of GM (F = 23.14, p = 0.00, Durbin Watson = 1.97). Thus, it is expected that affordances in the home environment are effective for the development of fine- and gross motor skills.
Stepwise regression was used to determine the amount and effectiveness of each of the five dimensions of the AHEMD on FM and GM scores. For FM and GM, only FMT was included in the regression equation, and this variable alone represented 24% and 20% of the FM (R = 0.49, F = 32.8, p = 0.00, Durbin Watson = 1.86) and GM (R = 0.45, F = 27.02, p = 0.00, Durbin Watson = 2.01) scores, respectively. The other four variables did not pass the desired criterion and were removed from the model. Therefore, the result was that FMT was the best predictor of FM and GM.