Evaluation of apparently healthy Egyptian infants and toddlers on the bayley-III scales according to age and sex

Table 4 Means, standard deviations and effect sizes for the Cognitive, Language and Motor composite scores according to gender

Age categories	Cognitive composite score			Language composite score			Motor composite score
Age categories	Boys M ± SD	Girls M ± SD	Effect size (d)	Boys M ± SD	Girls M ± SD	Effect size (d)	Boys M ± SD	Girls M ± SD	Effect size (d)
18 months to < 24 months	89.29 ± 13.42	91.97 ± 18.40	0.17	90.25 ± 13.79	93.76 ± 15.74	0.24	91.46 ± 11.36	97.83 ± 19.13	0.41
24 months to < 30 months	86.68 ± 13.87	86.05 ± 11.00	0.05	88.27 ± 10.18	86,35 ± 22.75	0.12	87.93 ± 17.22	85.74 ± 17.13	0.13
30 months to < 36 months	92.20 ± 15.59	96.50 ± 27.07	0.19	85.37 ± 16.31	96.37* ± 12.71	0.73	95.84 ± 19.21	102.33 ± 19.81	0.33
36 months to 42 months	98.07 ± 22.38	107.14 ± 14.37	0.44	94.29 ± 19.19	98.07 ± 11.47	0.21	103.30 ± 23.36	105.00 ± 19.87	0.07
Total sample	91.08 ± 16.53	94.41 ± 20.57	0.18	90.06 ± 15.15	93.89 ± 15.97	0.24	93.96 ± 18.06	97.87 ± 19.77	0.21

For an independent-samples t test, Cohen’s d is interpreted as follows: d = 0.2 indicates a small effect; d = 0.50 indicates a medium effect; and d = 0.80 indicates a large effect
*p < 0.05 is significant (t test)

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