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Table 3 Comparison of performance of Sri Lankan and US children on the cognitive and motor scales of the Bayley scales of infant development

From: Comparison of performance of Sri Lankan and US children on 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
  1. 1n refers to the sample size in each age group.
  2. 2SD refers to standard deviation.
  3. 3FM refers to fine motor subtest.
  4. 4GM refers to gross motor subtest.
  5. *indicates significance at 0.05 level.
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