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. Author manuscript; available in PMC: 2015 Jul 1.
Published in final edited form as: Early Hum Dev. 2014 May 9;90(7):343–348. doi: 10.1016/j.earlhumdev.2014.04.013

Table 2.

Developmental Outcome Scores by Assessment Age

Assessment 12 Month 24-Month 36-Month 12- vs. 24-Month 12- vs. 36-Month 24- vs. 36-Month
Mean (SD) Mean (SD) Mean (SD) t-test p t-test p t-test p
BSID-MDI 96.36 (15.35) 96.22 (15.23) 99.49 (11.55) 0.344 < 0.001 < 0.001
BSID-PDI 95.54 (20.25) 95.31 (15.74) 103.87 (16.01) 0.618 < 0.001 < 0.001
ASQ Total Score 241.91 (56.90) 230.87 (49.55) 244.83 (52.68) < 0.001 0.406 < 0.001

Note: SD=standard deviation, BSID=Bayley Scales of Infant Development, MDI=Mental Development Index, PDI-Psychomotor Development Index, ASQ=Ages & Stages Questionnaire.