Table 3.

Cronbach's alphas for the five subscales in each version of the J‐ASQ‐3

Questionnaire (months)	Communication	Gross motor	Fine motor	Problem solving	Personal–social
6	0.62	0.61	0.73	0.60	0.61
12	0.70	0.87	0.61	0.66	0.74
18	0.72	0.77	0.66	0.71	0.49
24	0.85	0.51	0.45	0.63	0.54
30	0.84	0.57	0.74	0.71	0.65
36	0.82	0.72	0.70	0.70	0.66
42	0.78	0.59	0.66	0.73	0.74
48	0.81	0.69	0.74	0.76	0.60
54	0.89	0.79	0.70	0.74	0.64
60	0.72	0.63	0.81	0.80	0.64

See Table 1 for the numbers of participants assessed with each questionnaire. J‐ASQ‐3, Japanese version of the Ages and Stages Questionnaires, third edition.