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TABLE 3

Incidence per 1000 Persons for ADHD Medication Among Boys Born 2005–2007 by Birth Month

Age, yNo. Cases and Incidence (95% CI) January to AprilNo. Cases and Incidence (95% CI) May to AugustNo. Cases and Incidence (95% CI) September to DecemberIRR (95% CI)
2005200620072005200620072005200620072005 September to December versus 2006 January to April2006 September to December versus 2007 January to April
45; 4.5 (3.4–6.1) 69; 6.6 (5.2–8.3) 68; 6.6 (5.2–8.3) 101; 9.5 (7.8–11.5) 74; 6.8 (5.4–8.6) 111; 10.2 (8.4–12.2) 116; 10.6 (8.7–12.8) 112; 11.1 (9.2–13.3) 131; 13.0 (10.9–15.3) 1.76 (1.31–2.38)a 1.69 (1.25–2.29)a 
82; 8.2 (6.7–10.3) 104; 9.9 (8.1–12.0) 117; 11.3 (9.4–13.5) 114; 10.7 (8.9–12.9) 134; 12.4 (10.5–14.7) 156; 14.3 (12.2–16.7) 140; 14.0 (11.8–16.5) 156; 15.5 (13.2–18.1) 172; 17.0 (14.7–19.7) 1.41 (1.09–1.82)a 1.37 (1.08–1.74)a 
98; 9.9 (8.1–12.0) 133; 12.7 (10.7–15.0) 137; 13.2 (11.2–15.6) 135; 12.7 (10.7–15.0) 154; 14.2 (12.2–16.7) 155; 14.2 (12.1–16.6) 151; 15.1 (12.8–17.6) 155; 15.4 (13.1–18.0) 170; 16.8 (14.5–19.5) 1.19 (0.94–1.50) 1.16 (0.92–1.46) 
88; 8.9 (7.2–10.9) 112; 10.7 (8.9–12.8) 124; 12.0 (10.0–14.3) 108; 10.2 (8.4–12.2) 130; 12.0 (10.1–14.3) 159; 14.6 (12.5–17.0) 131; 13.1 (11.0–15.5) 140; 13.9 (11.8–16.4) 172; 17.0 (14.7–19.7) 1.22 (0.95–1.58) 1.16 (0.91–1.48) 
10 88; 8.9 (7.2–10.9) 88; 8.4 (6.8–10.3) 102; 9.9 (8.1–12.0) 103; 9.7 (8.0–11.7) 117; 10.8 (9.0–12.9) 71; 6.5 (5.2–8.2) 101; 10.1 (8.3–12.2) 131; 13.0 (10.9–15.4) 22; 2.2 (1.4–3.3) 1.20 (0.90–1.60) 1.31 (1.02–1.71)a 
11 69; 7.0 (5.5–8.8) 66; 6.3 (4.9–8.0) — 101; 9.5 (7.8–11.5) 56; 5.2 (4.0–6.7) — 77; 7.7 (6.1–9.6) 10; 1.0 (0.5–1.8) — 1.22 (0.88–1.70) — 
12 59; 6.0 (4.6–7.7) — — 43; 4.0 (3.0–5.4) — — 17; 1.7 (1.1–2.7) — — — — 
Age, yNo. Cases and Incidence (95% CI) January to AprilNo. Cases and Incidence (95% CI) May to AugustNo. Cases and Incidence (95% CI) September to DecemberIRR (95% CI)
2005200620072005200620072005200620072005 September to December versus 2006 January to April2006 September to December versus 2007 January to April
45; 4.5 (3.4–6.1) 69; 6.6 (5.2–8.3) 68; 6.6 (5.2–8.3) 101; 9.5 (7.8–11.5) 74; 6.8 (5.4–8.6) 111; 10.2 (8.4–12.2) 116; 10.6 (8.7–12.8) 112; 11.1 (9.2–13.3) 131; 13.0 (10.9–15.3) 1.76 (1.31–2.38)a 1.69 (1.25–2.29)a 
82; 8.2 (6.7–10.3) 104; 9.9 (8.1–12.0) 117; 11.3 (9.4–13.5) 114; 10.7 (8.9–12.9) 134; 12.4 (10.5–14.7) 156; 14.3 (12.2–16.7) 140; 14.0 (11.8–16.5) 156; 15.5 (13.2–18.1) 172; 17.0 (14.7–19.7) 1.41 (1.09–1.82)a 1.37 (1.08–1.74)a 
98; 9.9 (8.1–12.0) 133; 12.7 (10.7–15.0) 137; 13.2 (11.2–15.6) 135; 12.7 (10.7–15.0) 154; 14.2 (12.2–16.7) 155; 14.2 (12.1–16.6) 151; 15.1 (12.8–17.6) 155; 15.4 (13.1–18.0) 170; 16.8 (14.5–19.5) 1.19 (0.94–1.50) 1.16 (0.92–1.46) 
88; 8.9 (7.2–10.9) 112; 10.7 (8.9–12.8) 124; 12.0 (10.0–14.3) 108; 10.2 (8.4–12.2) 130; 12.0 (10.1–14.3) 159; 14.6 (12.5–17.0) 131; 13.1 (11.0–15.5) 140; 13.9 (11.8–16.4) 172; 17.0 (14.7–19.7) 1.22 (0.95–1.58) 1.16 (0.91–1.48) 
10 88; 8.9 (7.2–10.9) 88; 8.4 (6.8–10.3) 102; 9.9 (8.1–12.0) 103; 9.7 (8.0–11.7) 117; 10.8 (9.0–12.9) 71; 6.5 (5.2–8.2) 101; 10.1 (8.3–12.2) 131; 13.0 (10.9–15.4) 22; 2.2 (1.4–3.3) 1.20 (0.90–1.60) 1.31 (1.02–1.71)a 
11 69; 7.0 (5.5–8.8) 66; 6.3 (4.9–8.0) — 101; 9.5 (7.8–11.5) 56; 5.2 (4.0–6.7) — 77; 7.7 (6.1–9.6) 10; 1.0 (0.5–1.8) — 1.22 (0.88–1.70) — 
12 59; 6.0 (4.6–7.7) — — 43; 4.0 (3.0–5.4) — — 17; 1.7 (1.1–2.7) — — — — 

IRRs are between boys born in the last third of the year (September to December) and boys born in the first third (January to April) of the following year. CI, confidence interval; —, not applicable.

a

IRR is significant at P < .05.

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