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Table 1 Baseline characteristics for cases and controls

From: The prevalence and incidence, resource use and financial costs of treating people with attention deficit/hyperactivity disorder (ADHD) in the United Kingdom (1998 to 2010)

Age group Parameter Cases References
All ages N 3,229 7,429
Males, n (%) 2,759 (85%) 6,354 (86%)
Females, n (%) 470 (15%) 1,075 (14%)
Age, mean (sd), years 10.4 (5.9) 10.4 (6.1)
Aged 6 to 17 years at index date N 2,873 6,598
Males, n (%) 2,487 (87%) 5,707 (86%)
Females, n (%) 386 (13%) 891 (14%)
Age, mean (sd), years 9.8 (2.8) 9.8 (2.8)
Aged ≥18 years at index date N 141 300
Males, n (%) 86 (61%) 183 (61%)
Females, n (%) 55 (39%) 117 (39%)
Age, mean (sd), years 31.7 (10.7) 33.2 (12.3)