Table 2.

Comparison of Social Responsiveness Scale total raw score between the United States and Japan

Grade	Country				t	P	d
	Japan		US
	N	Mean (SD)	N	Mean (SD)
1	3102	35.3 (17.6)	71	29.6 (25.6)	1.87	0.06	0.318
2	2891	34.2 (17.4)	92	34.9 (26.9)	0.25	0.80	0.041
3	2786	33.2 (18.0)	109	35.7 (26.8)	0.97	0.33	0.136
4	2739	31.9 (17.5)	227	35.3 (24.9)	2.02	0.04	0.188
5	2703	32.0 (18.0)	214	34.5 (25.3)	1.42	0.16	0.134
6	2408	30.8 (18.7)	211	31.7 (21.5)	0.59	0.56	0.049
7	2123	31.3 (18.4)	161	31.1 (20.6)	0.12	0.90	0.008
8	2040	31.1 (19.1)	137	31.9 (23.7)	0.39	0.70	0.040
9	1532	30.2 (19.7)	124	38.9 (29.2)	3.26	0.00	0.422
Total	22 344	32.5 (18.2)	1626*	33.6 (24.7)	1.76	0.08	0.051

Grade 1 children are usually 6–7 years old. Most grade 1 participants were 7 years old at the time of the survey.

^*US data were cited from the SRS manual (p. 28) (10.