Table 3.
Suicides, person-years of exposure, rates, and relative rates of suicide by allergen season, sex, and agea
| Preexposure | High exposure | Postexposure | High vs preexposure RR (95% CI) | Post vs preexposure RR (95% CI) | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Suicides | Person-years | Rate (95% CI) | Suicides | Person-years | Rate (95% CI) | Suicides | Person-years | Rate (95% CI) | |||
| Tree season | |||||||||||
| All suicides | 958 | 9 837 185 | 9.7 (9.1, 10.4) | 999 | 9 837 185 | 10.2 (9.5, 10.8) | 460 | 4 981 431 | 9.2 (8.4, 10.1) | 1.0 (1.0, 1.1) | 0.9 (0.8, 1.1) |
| Males—younger | 629 | 4 239 677 | 14.8 (13.7, 16.0) | 617 | 4 239 677 | 14.6 (13.4, 15.7) | 290 | 2 147 349 | 13.5 (12.0, 15.2) | 1.0 (0.9, 1.1) | 0.9 (0.8, 1.0) |
| Males—older | 115 | 484 997 | 23.7 (19.7, 28.5) | 130 | 484 997 | 26.8 (22.6, 31.8) | 63 | 246 643 | 25.5 (20.0, 32.7) | 1.1 (0.9, 1.5) | 1.1 (0.8, 1.5) |
| Females—younger | 185 | 4 362 038 | 4.2 (3.7, 4.9) | 217 | 4 362 038 | 5.0 (4.4, 5.7) | 86 | 2 206 899 | 3.9 (3.2, 4.8) | 1.2 (1.0, 1.4) | 0.9 (0.7, 1.2) |
| Females—older | 29 | 750 473 | 3.9 (2.7, 5.6) | 35 | 750 473 | 4.7 (3.3, 6.5) | 21 | 380 540 | 5.5 (3.6, 8.5) | 1.2 (0.7, 2.0) | 1.4 (0.8, 2.5) |
| Nonviolent suicides | 144 | 9 837 184 | 1.5 (1.2, 1.7) | 194 | 9 837 184 | 2.0 (1.7, 2.3) | 88 | 4 981 431 | 1.8 (1.4, 2.2) | 1.3 (1.1, 1.7) | 1.2 (0.9, 1.6) |
| Males—younger | 97 | 4 239 677 | 2.3 (1.9, 2.8) | 105 | 4 239 677 | 2.5 (2.0, 3.0) | 50 | 2 147 349 | 2.3 (1.8, 3.1) | 1.1 (0.8, 1.4) | 1.0 (0.7, 1.4) |
| Males—older | 12 | 484 997 | 2.5 (1.4, 4.4) | 18 | 484 997 | 3.7 (2.3, 5.9) | 12 | 246 643 | 4.9 (2.8, 8.6) | 1.5 (0.7, 3.1) | 2.0 (0.9, 4.4) |
| Females—younger | 32 | 4 362 038 | 0.7 (0.5, 1.0) | 63 | 4 362 037 | 1.4 (1.1, 1.8) | 19 | 2 206 899 | 0.9 (0.5, 1.3) | 2.0 (1.3, 3.0) | 1.2 (0.7, 2.1) |
| Females—older | 3 | 750 473 | 0.4 (0.1, 1.2) | 8 | 750 473 | 1.1 (0.5, 2.1) | 7 | 380 540 | 1.8 (0.9, 3.9) | 2.7 (0.7, 10.1) | 4.6 (1.2, 17.8) |
| Violent suicides | 767 | 9 867 185 | 7.8 (7.3, 8.4) | 743 | 9 837 185 | 7.6 (7.0, 8.1) | 347 | 4 981 431 | 7.0 (6.3, 7.7) | 1.0 (0.9, 1.1) | 0.9 (0.8, 1.0) |
| Males—younger | 512 | 4 269 677 | 12.1 (11.1, 13.2) | 486 | 4 239 677 | 11.5 (10.5, 12.5) | 224 | 2 147 349 | 10.4 (9.2, 11.9) | 0.9 (0.8, 1.1) | 0.9 (0.7, 1.0) |
| Males—older | 100 | 484 997 | 20.6 (16.9, 25.1) | 108 | 484 997 | 22.3 (18.4, 26.9) | 49 | 246 643 | 19.9 (15.0, 26.3) | 1.1 (0.8, 1.4) | 1.0 (0.7, 1.4) |
| Females—younger | 131 | 4 362 038 | 3.0 (2.5, 3.6) | 125 | 4 362 038 | 2.9 (2.4, 3.4) | 61 | 2 206 899 | 2.8 (2.2, 3.6) | 1.0 (0.7, 1.2) | 0.9 (0.7, 1.2) |
| Females—older | 24 | 750 473 | 3.2 (2.1, 4.8) | 24 | 750 473 | 3.2 (2.1, 4.8) | 13 | 380 540 | 3.4 (2.0, 5.9) | 1.0 (0.6, 1.8) | 1.1 (0.5, 2.1) |
| Ragweed season | |||||||||||
| All suicides | 424 | 3 681 222 | 11.5 (10.5, 12.7) | 743 | 6 091 065 | 12.2 (11.4, 13.1) | 644 | 5 924 903 | 10.9 (10.1, 11.7) | 1.1 (0.9, 1.2) | 0.9 (0.8, 1.1) |
| Males—younger | 273 | 1 598 417 | 17.1 (15.2, 19.2) | 465 | 2 636 818 | 17.6 (16.1, 19.3) | 425 | 2 565 514 | 16.6 (15.1, 18.2) | 1.0 (0.9, 1.2) | 1.0 (0.8, 1.1) |
| Males—older | 56 | 176 297 | 31.8 (24.4, 41.3) | 117 | 297 432 | 39.3 (32.8, 47.2) | 74 | 286 098 | 25.9 (20.6, 32.5) | 1.2 (0.9, 1.7) | 0.8 (0.6, 1.2) |
| Females—younger | 83 | 1 627 896 | 5.1 (4.1, 6.3) | 144 | 2 701 889 | 5.3 (4.5, 6.3) | 127 | 2 628 700 | 4.8 (4.1, 5.7) | 1.0 (0.8, 1.4) | 0.9 (0.7, 1.2) |
| Females—older | 12 | 278 611 | 4.3 (2.4, 7.6) | 17 | 454 926 | 3.7 (2.3, 6.0) | 18 | 444 591 | 4.0 (2.6, 6.4) | 0.9 (0.4, 1.8) | 0.9 (0.5, 2.0) |
| Nonviolent suicides | 70 | 3 681 221 | 1.9 (1.5, 2.4) | 124 | 6 091 065 | 2.0 (1.7, 2.4) | 120 | 5 924 903 | 2.0 (1.7, 2.4) | 1.1 (0.8, 1.4) | 1.1 (0.8, 1.4) |
| Males—younger | 45 | 1 598 417 | 2.8 (2.1, 3.8) | 66 | 2 636 818 | 2.5 (2.0, 3.2) | 68 | 2 565 514 | 2.7 (2.1, 3.4) | 0.9 (0.6, 1.3) | 0.9 (0.6, 1.4) |
| Males—older | 5 | 176 297 | 2.8 (1.2, 6.8) | 17 | 297 432 | 5.7 (3.6, 9.2) | 13 | 286 098 | 4.5 (2.6, 7.8) | 2.0 (0.7, 5.5) | 1.6 (0.6, 4.5) |
| Females—younger | 17 | 1 627 896 | 1.0 (0.6, 1.7) | 36 | 2 701 889 | 1.3 (1.0, 1.8) | 35 | 2 628 700 | 1.3 (1.0, 1.9) | 1.3 (0.7, 2.3) | 1.3 (0.7, 2.3) |
| Females—older | 3 | 278 611 | 1.1 (0.3, 3.3) | 5 | 454 926 | 1.1 (0.5, 2.6) | 4 | 444 591 | 0.9 (0.3, 2.4) | 1.0 (0.2, 4.3) | 0.8 (0.2, 3.7) |
| Violent suicides | 332 | 3 681 221 | 9.0 (8.1, 10.0) | 558 | 6 091 065 | 9.2 (8.4, 10.0) | 490 | 5 924 903 | 8.3 (7.6, 9.0) | 1.0 (0.9, 1.2) | 0.9 (0.8, 1.1) |
| Males—younger | 216 | 1 598 417 | 13.5 (11.8, 15.4) | 368 | 2 636 818 | 14.0 (12.6, 15.5) | 344 | 2 565 514 | 13.4 (12.1, 14.9) | 1.0 (0.9, 1.2) | 1.0 (0.8, 1.2) |
| Males—older | 50 | 176 297 | 28.4 (21.5, 37.4) | 94 | 297 432 | 31.6 (25.8, 38.7) | 58 | 286 098 | 20.3 (15.7, 26.2) | 1.1 (0.8, 1.6) | 0.7 (0.5, 1.0) |
| Females—younger | 58 | 1 627 896 | 3.6 (2.8, 4.6) | 85 | 2 701 889 | 3.1 (2.5, 3.9) | 76 | 2 628 700 | 2.9 (2.3, 3.6) | 0.9 (0.6, 1.2) | 0.8 (0.6, 1.1) |
| Females—older | 8 | 278 611 | 2.9 (1.4, 5.7) | 11 | 454 926 | 2.4 (1.3, 4.4) | 12 | 444 591 | 2.7 (1.5, 4.8) | 0.8 (0.3, 2.1) | 0.9 (0.4, 2.3) |
aRates per 100 000 person-years; CI=confidence interval; RR=relative rates.
Bold represents statistically significant.