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Table 2 Breakdown of ADHD by age within school year

From: Age within schoolyear and attention-deficit hyperactivity disorder in Scotland and Wales

 

Scotland*

Wales **

Month of birth

N

ADHD

N (%)

Month of birth

N

ADHD

N (%)

1 (oldest)

Mar-May

186,002

1,450 (0.78)

Sept-Nov

76,944

684 (0.89)

2

June-Aug

191,822

1,637 (0.85)

Dec-Feb

74,430

730 (0.98)

3

Sept-Nov

184,751

1,609 (0.87)

Mar-May

75,655

737 (0.97)

4 (youngest)

Dec-Feb

136,750

1,107 (0.81)

June-Aug

76,552

767 (1.00)

  1. *Chi squared test for trend p = 0.164
  2. **Chi squared test for trend p = 0.112