Table 3 Comparison of performance of Sri Lankan and US children on the cognitive and motor scales of the Bayley scales of infant development
Age group | Subtest | Sri Lankan children (n = 50)1 | US children (n = 100) | Mean difference | 95% confidence interval of the difference | p-value | |||
|---|---|---|---|---|---|---|---|---|---|
Mean | SD1 | Mean | SD2 | Lower | Upper | ||||
6 months | Cognitive | 9.860 | 1.730 | 10.000 | 3.000 | -0.1400 | -1.046 | 0.766 | 0.761 |
FM3 | 10.640 | 1.940 | 10.000 | 3.000 | 0.6400 | -0.283 | 1.563 | 0.171 | |
GM4 | 10.480 | 2.050 | 10.000 | 3.000 | 0.4800 | -0.453 | 1.412 | 0.310 | |
12 months | Cognitive | 11.760 | 2.620 | 10.000 | 3.000 | 1.7600 | 0.774 | 2.746 | 0.001* |
FM2 | 9.900 | 2.430 | 10.000 | 3.000 | -0.1000 | -1.067 | 0.867 | 0.838 | |
GM3 | 8.980 | 2.190 | 10.000 | 3.000 | -1.0200 | -1.964 | -0.076 | 0.034* | |
24 months | Cognitive | 9.100 | 1.520 | 10.000 | 3.000 | -0.9000 | -1.792 | -0.008 | 0.048* |
FM2 | 10.160 | 1.350 | 10.000 | 3.000 | 0.1600 | -0.721 | 1.041 | 0.720 | |
GM3 | 9.980 | 1.100 | 10.000 | 3.000 | -0.0200 | -0.887 | 0.847 | 0.964 | |