| Casesa (n = 1318) | Person-years | Age-adjusted RR (95% CI) | Multivariate RR (95% CI)b |
---|---|---|---|---|
Figure at age 5 years | ||||
   1 | 350 | 252,779 | 1.00 (ref.) | 1.00 (ref.) |
   2 | 431 | 335,974 | 0.97 (0.84–1.11) | 0.96 (0.83–1.11) |
   3 | 304 | 251,625 | 0.89 (0.76–1.04) | 0.88 (0.76–1.03) |
   4 | 173 | 133,574 | 0.94 (0.78–1.13) | 0.93 (0.77–1.12) |
   ≥ 5 | 60 | 70,740 | 0.59 (0.45–0.78) | 0.57 (0.43–0.75) |
P for trendc | Â | Â | 0.002 | 0.001 |
Figure at age 10 years | ||||
   1 | 277 | 191,720 | 1.00 (ref.) | 1.00 (ref.) |
   2 | 423 | 323,197 | 0.95 (0.82–1.11) | 0.96 (0.82–1.11) |
   3 | 307 | 239,185 | 0.92 (0.79–1.09) | 0.93 (0.79–1.10) |
   4 | 197 | 165,957 | 0.84 (0.70–1.01) | 0.84 (0.70–1.01) |
   ≥ 5 | 114 | 124,633 | 0.62 (0.50–0.77) | 0.61 (0.49–0.76) |
P for trendc | Â | Â | <0.0001 | <0.0001 |
Figure at age 20 years | ||||
   1 | 73 | 44,399 | 1.00 (ref.) | 1.00 (ref.) |
   2 | 414 | 271,292 | 1.04 (0.81–1.33) | 1.05 (0.82–1.35) |
   3 | 474 | 397,651 | 0.85 (0.67–1.09) | 0.87 (0.68–1.11) |
   4 | 247 | 219,136 | 0.81 (0.62–1.05) | 0.81 (0.63–1.06) |
   ≥ 5 | 110 | 112,213 | 0.71 (0.53–0.95) | 0.70 (0.52–0.94) |
P for trendc | Â | Â | <0.0001 | <0.0001 |
Average childhood figure (ages 5–10 years) | ||||
   1 | 262 | 177,512 | 1.00 (ref.) | 1.00 (ref.) |
   1.5–2 | 416 | 322,714 | 0.92 (0.79–1.08) | 0.93 (0.79–1.08) |
   2.5–3 | 339 | 265,111 | 0.90 (0.77–1.06) | 0.90 (0.76–1.06) |
   3.5–4.5 | 253 | 215,175 | 0.82 (0.69–0.97) | 0.81 (0.68–0.96) |
   ≥ 5 | 48 | 64,180 | 0.49 (0.36–0.67) | 0.48 (0.35–0.65) |
P for trendc | Â | Â | <0.0001 | <0.0001 |
Average adolescent figure (ages 10–20 years) | ||||
   1 | 56 | 34,780 | 1.00 (ref.) | 1.00 (ref.) |
   1.5–2 | 398 | 267,086 | 1.07 (0.81–1.41) | 1.08 (0.82–1.43) |
   2.5–3 | 449 | 366,516 | 0.92 (0.69–1.21) | 0.93 (0.71–1.24) |
   3.5–4.5 | 363 | 312,070 | 0.85 (0.64–1.13) | 0.86 (0.65–1.14) |
   ≥ 5 | 52 | 64,240 | 0.58 (0.40–0.85) | 0.57 (0.39–0.83) |
P for trendc | Â | Â | <0.0001 | <0.0001 |