Table 2.

The summary statistics of the CREDI, Bayley-III, and ASQ-3

	Mean	SD	Min	Max
1. CREDI(n = 946)
Z-score
Cognitive	0.058	1.095	−2.981	5.887
Language	0.334	1.068	−2.682	6.951
Motor	−0.012	1.020	−3.311	6.069
Social-emotional	0.287	1.047	−3.010	5.101
2. Bayley-III(n = 248)
Composite scores
Cognitive	102.036	13.527	65.000	145.000
Language	103.423	16.911	62.000	153.000
Motor	105.871	16.436	61.000	151.000
3. ASQ-3(n = 955)
Scores
Problem Solving	46.549	12.500	0.000	60.000
Communication	45.327	13.604	0.000	60.000
Fine Motor	47.611	13.937	0.000	60.000
Gross Motor	41.897	14.621	0.000	60.000
Personal-Social	44.904	11.644	0.000	60.000

Note: The CREDI Z-scores were constructed by comparing the raw score in each domain to the average raw score in our CREDI reference population of a particular age. A z-score of 0 thus means that the child has exactly the same score on that particular domain as the average same-age child in the CREDI reference population. A score of “-1” means that the child’s raw score is 1 standard deviation below the same-age average of the reference population (more details about the reference population can be found in the CREDI data management & scoring manual). The range score for each domain of Bayley-III composite scores is 55 to 145 for Cognitive, 47 to 153 for Language, and 46 to 154 for Motor, respectively. The raw score range of the ASQ-3 for each domain is from 0 to 60