Table 1.

Internal consistency of developmental domains of the K-DST 1st edition by monthly age group

Age group (mo)	Cronbach alpha
	Gross motor	Fine motor	Cognition	Language	Social skills	Self-help
4–5	0.77	0.84	0.77	0.80	0.78	-
6–7	0.76	0.81	0.77	0.80	0.74	-
8–9	0.88	0.73	0.77	0.83	0.78	-
10–11	0.66	0.76	0.77	0.80	0.77	-
12–13	0.89	0.84	0.71	0.81	0.83	-
14–15	0.80	0.74	0.69	0.85	0.76	-
16–17	0.89	0.87	0.84	0.87	0.85	-
18–19	0.81	0.87	0.90	0.89	0.90	0.84
20–21	0.82	0.82	0.84	0.90	0.84	0.83
22–23	0.89	0.88	0.87	0.91	0.89	0.90
24–26	0.82	0.76	0.86	0.90	0.90	0.83
27–29	0.84	0.74	0.84	0.90	0.89	0.87
30–32	0.79	0.79	0.89	0.87	0.89	0.82
33–35	0.84	0.84	0.86	0.91	0.87	0.83
36–41	0.76	0.86	0.85	0.93	0.90	0.88
42–47	0.76	0.88	0.85	0.88	0.86	0.85
48–53	0.80	0.90	0.84	0.90	0.90	0.86
54–59	0.81	0.87	0.78	0.84	0.83	0.82
60–65	0.87	0.88	0.82	0.84	0.83	0.78
66–71	0.84	0.87	0.88	0.87	0.87	0.84

K-DST, Korean Developmental Screening Test for Infants and Children.