Percentage of children with any psychiatric disorder and mean symptom score on the parent, teacher, and self completed strengths and difficulties questionnaire by relative age for England and Wales

Outcome measureOldest third (n=3134)Middle third (n=3014)Youngest third (n=3235)Significance
All ages
Any psychiatric diagnosis* (n=9383)8.3 (7.4 to 9.3)8.8 (7.8 to 9.8)9.9 (8.9 to 10.9)χ2=4.58, P=0.03
Parent reported symptoms (n=9267)8.2 (8.0 to 8.4)8.4 (8.2 to 8.6)8.8 (8.6 to 9.0)r=0.05, P<0.001
Teacher reported symptoms (n=7452)6.2 (5.9 to 6.4)6.6 (6.3 to 6.8)7.0 (6.8 to 7.3)r=0.06, P<0.001
Self reported symptoms (n=3799)10.2 (9.9 to 10.4)10.4 (10.1 to 10.7)10.6 (10.4 to 10.9)r=0.04, P=0.02
Ages 5-10(n=1786)(n=1712)(n=1843)
Any psychiatric diagnosis* (n=5341)7.4 (6.2 to 8.4)7.1 (5.9 to 8.3)8.5 (7.2 to 9.8)χ2=1.34, P=0.2
Parent reported symptoms (n=5288)8.3 (8.0 to 8.6)8.5 (8.2 to 8.8)9.0 (8.8 to 9.3)r=0.05, P<0.001
Teacher reported symptoms (n=4371)6.2 (5.9 to 6.5)6.7 (6.4 to 7.0)7.3 (7.0 to 7.6)r=0.08, P<0.001
Ages 11-15(n=1348)(n=1302)(n=1392)
Any psychiatric diagnosis* (n=4042)9.5 (7.9 to 11.1)11.0 (9.3 to 12.7)11.7 (10.0 to 13.4)χ2=3.49, P=0.06
Parent reported symptoms (n=3979)8.0 (7.7 to 8.3)8.3 (8.0 to 8.6)8.6 (8.2 to 8.9)r=0.04, P=0.02
Teacher reported symptoms (n=3081)6.1 (5.7 to 6.4)6.3 (5.9 to 6.7)6.6 (6.2 to 7.0)r=0.03, P=0.06
Self reported symptoms (n=3799)10.2 (9.9 to 10.4)10.4 (10.1 to 10.7)10.6 (10.4 to 10.9)r=0.04, P=0.02
  • * Percentage (95% confidence interval); χ2 test.

  • † Mean score (95% confidence interval); Pearson correlation coefficient.