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Table 2 Standardized alphas by developmental domain and age interval for Mohawk and U.S. populations

From: Developmental screening in a Canadian First Nation (Mohawk): psychometric properties and adaptations of ages & stages questionnaires (2nd edition)

Age interval n Communication Gross motor Fine motor Problem solving Personal-social
  Mo U.S. Mo U.S. Mo U.S. Mo U.S. Mo U.S. Mo U.S.
36 monthsa 68 231 .70 .69 .43 .76 .79 .72 .31 .66 .40 .55
42 monthsb 55 950 .68 .72 .56 .68 .61 .76 .70 .72 .31 .66
48 monthsa 74 336 .84 .79 .75 .84 .81 .86 .71 .85 .70 .86
54 monthsb 61 586 .83 .83 .71 .73 .73 .79 .64 .75 .65 .71
  1. Note. Mo: Mohwak. Cronbach’s alphas for the U.S. sample were combined from two different sources: aSquires et al. [3] (second edition) and bSquires et al. [18] (third edition) user’s guides as the coefficients for the 42- and 54-month intervals were not available in the second edition. Coefficients for the U.S. sample are presented for informational purposes.