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Table 1 Number of children in the normative sample by gender and grade

From: Normative data and psychometric properties of the strengths and difficulties questionnaire among Japanese school-aged children

Grade SDQ parent ratings (n = 24,519) SDQ teacher ratings (n = 7,977)
Boys % Girls % Boys % Girls %
1 1,792 14.4 1,633 13.6 526 13.1 519 13.1
2 1,662 13.3 1,514 12.6 547 13.6 540 13.6
3 1,526 12.2 1,541 12.8 481 12.0 485 12.2
4 1,479 11.9 1,506 12.5 509 12.7 506 12.8
5 1,562 12.5 1,382 11.5 499 12.4 478 12.0
6 1,321 10.6 1,334 11.1 484 12.1 486 12.3
7 1,162 9.3 1,186 9.8 346 8.6 343 8.6
8 1,100 8.8 1,136 9.4 316 7.9 307 7.7
9 868 7.0 815 6.8 302 7.5 303 7.6
Total 12,472   12,047   4,010   3,967  
  1. Note. SDQ, strengths and difficulties questionnaire. Most grade 1 participants were 7 years old at the time of the survey.