| Total | 1 pain site | 2 pain sites | 3 pain sites | |||
---|---|---|---|---|---|---|---|
 | N | OR | (95% CI) | OR | (95% CI) | OR | (95% CI) |
Age (years)a) | |||||||
 12 | 720 | 1.88 | (1.20–2.95) | 3.20 | (1.88–5.46) | 3.97 | (1.82–8.67) |
 13 | 2937 | 1.92 | (1.55–2.38) | 3.71 | (2.91–4.74) | 5.88 | (3.94–8.77) |
 14 | 3011 | 1.75 | (1.42–2.14) | 2.57 | (2.03–3.25) | 4.96 | (3.40–7.24) |
 15 | 3060 | 1.60 | (1.32–1.95) | 3.00 | (2.39–3.76) | 5.45 | (3.79–7.83) |
 16 | 3438 | 1.76 | (1.47–2.10) | 3.29 | (2.64–4.10) | 6.46 | (4.43–9.41) |
 17 | 3096 | 2.07 | (1.72–2.50) | 2.87 | (2.27–3.63) | 5.04 | (3.44–7.39) |
 18 | 1842 | 2.14 | (1.67–2.76) | 3.28 | (2.43–4.42) | 5.38 | (3.29–8.79) |
Genderb) | |||||||
 Males | 8992 | 1.84 | (1.64–2.06) | 3.02 | (2.61–3.50) | 4.23 | (3.28–5.47) |
 Females | 9112 | 1.87 | (1.67–2.10) | 3.16 | (2.78–3.60) | 6.28 | (5.13–7.69) |