Table 2.

Number of participants below the cut‐off value of the Japanese translation of the Ages and Stages Questionnaires questionnaire for each month of age and category

Participants	Age (months)	Communication skill n (%)	Gross motor skills, n (%)	Fine motor skills, n (%)	Problem‐solving ability, n (%)	Personal and social skills, n (%)
All (n = 81,705)	6	481 (0.6)	7,869 (9.6)	3,841 (4.7)	8,207 (10.0)	2,798 (3.4)
	12	82 (0.1)	4,038 (4.9)	4,174 (5.1)	3,703 (4.5)	850 (1.0)
	18	1,435 (1.8)	3,069 (3.8)	2,896 (3.5)	2,666 (3.3)	1,616 (2.0)
	24	2,587 (3.2)	3,849 (4.7)	1,403 (1.7)	2,792 (3.4)	1,838 (2.2)
	30	3,152 (3.9)	2,821 (3.5)	3,790 (4.6)	3,698 (4.5)	2,156 (2.6)
	36	2,584 (3.2)	2,914 (3.6)	4,988 (6.1)	4,860 (5.9)	2,125 (2.6)
	42	2,695 (3.3)	2,782 (3.4)	3,338 (4.1)	3,695 (4.5)	2,845 (3.5)
	48	2,809 (3.4)	3,542 (4.3)	4,155 (5.1)	2,209 (2.7)	3,463 (4.2)

ASQ‐3, Japanese translation of the Ages and Stages Questionnaires, Third Edition.