Table 4.

Concurrent validity calculated using the KSPD and the J‐Denver‐II

Questionnaire and sample size for each analysis	No. J‐ASQ‐3 domains screened positive	No. participants screened positive	Sensitivity (%)	Specificity (%)	Correctly classified (%)	Likelihood ratio (+)	Likelihood ratio (−)
KSPD (cut‐off = DQ < 70)
Total	≥1	203	96.0	48.8	64.3	1.9	0.1
n = 308	≥2	145	92.1	74.9	80.5	3.7	0.1
6, 12 months	≥1	31	100.0	45.5	70.7	1.8	0.0
n = 41	≥2	25	79.0	54.6	65.9	1.7	0.4
18, 24 months	≥1	39	100.0	43.9	59.7	1.8	0.0
n = 57	≥2	25	100.0	78.1	84.2	4.6	0.0
30, 36 months	≥1	51	95.7	46.3	61.0	1.8	0.1
n = 77	≥2	38	95.7	70.4	77.9	3.2	0.1
42, 48 months	≥1	45	90.9	43.2	59.1	1.6	0.2
n = 66	≥2	34	90.9	68.2	75.8	2.9	0.1
54, 60 months	≥1	37	95.2	63.0	73.1	2.6	0.1
n = 67	≥2	23	95.2	93.5	94.0	14.6	0.1
J‐Denver‐II screening positive
Total	≥1	198	75.6	74.7	75.4	3.0	0.3
n = 309	≥2	139	56.3	93.0	64.7	8.0	0.5
6, 12 months	≥1	32	84.2	100.0	86.1		0.2
n = 43	≥2	26	68.4	100.0	72.1		0.3
18, 24 months	≥1	40	82.6	85.7	83.3	5.8	0.2
n = 60	≥2	23	50.0	100.0	61.7		0.5
30, 36 months	≥1	55	75.8	66.7	73.3	2.3	0.4
n = 86	≥2	38	58.1	91.7	67.4	7.0	0.5
42, 48 months	≥1	36	72.1	66.7	70.7	2.2	0.4
n = 58	≥2	29	62.8	86.7	69.0	4.7	0.4
54, 60 months	≥1	35	65.3	76.9	67.7	2.8	0.5
n = 62	≥2	23	44.9	92.3	54.8	5.8	0.6

DQ <70 in the KSPD and counting at least one delay or two or more cautions in the J‐Denver‐II were used as cut‐off points. The likelihood ratio (+) and/or odds ratio could not be calculated when the sensitivity or specificity was 100.0%. DQ, developmental quotient; J‐ASQ‐3, Japanese version of the Ages and Stages Questionnaires, third edition; J‐Denver‐II, Japanese version of the Denver Developmental Screening Test; KSPD, Kyoto Scale of Psychological Development 2001.