Table 1.
Participants characteristics of male students in the Glasgow Alumni cohort (n = 11,274)
| No asthma or atopy (n = 10 130) | Asthma only (n = 268) | Asthma with atopy (n = 141) | Atopy only (n = 735) | p value | Bronchitis (n = 829) | ||
|---|---|---|---|---|---|---|---|
| N (%) | N (%) | N (%) | N (%) | N (%) | p trend | ||
| Age | |||||||
| 16–20 | 5,505 (89.2) | 168 (2.72) | 73 (1.18) | 427 (6.92) | <0.001 | 432 (7.00) | 0.21 |
| 21–25 | 3,656 (90.0) | 81 (1.99) | 62 (1.53) | 264 (6.50) | 320 (7.88) | ||
| 26–30 | 969 (93.4) | 19 (1.83) | 6 (0.58) | 44 (4.24) | 77 (7.42) | ||
| Father’s social class | |||||||
| I | 1,923 (87.8) | 42 (1.92) | 45 (2.05) | 180 (8.22) | <0.001 | 178 (8.13) | 0.11 |
| II | 3,529 (90.2) | 80 (2.04) | 53 (1.35) | 251 (6.41) | 289 (7.39) | ||
| III + IV + V | 4,326 (90.8) | 132 (2.77) | 36 (0.76) | 269 (5.65) | 344 (7.07) | ||
| BMI tertiles | |||||||
| 1 | 3,242 (89.2) | 112 (3.08) | 65 (1.79) | 216 (5.94) | <0.001 | 324 (8.91) | 0.001 |
| 2 | 3,502 (89.5) | 91 (2.33) | 38 (0.97) | 280 (7.16) | 248 (6.34) | ||
| 3 | 3,335 (90.9) | 63 (1.72) | 37 (1.01) | 236 (6.43) | 251 (6.84) | ||
| Birth order | |||||||
| 1 | 5,368 (88.8) | 157 (2.60) | 90 (1.49) | 430 (7.11) | 0.001 | 478 (7.91) | 0.001 |
| 2 | 2,700 (90.4) | 68 (2.28) | 31 (1.04) | 187 (6.26) | 209 (7.00) | ||
| 3+ | 1,939 (92.1) | 41 (1.95) | 15 (0.71) | 111 (5.27) | 133 (6.32) | ||
| Number of siblings | |||||||
| 0 | 1,824 (88.0) | 56 (2.70) | 26 (1.25) | 168 (8.10) | 0.06 | 173 (8.34) | 0.001 |
| 1 | 3,649 (89.9) | 92 (2.27) | 49 (1.21) | 267 (6.58) | 324 (7.99) | ||
| 2 | 2,418 (90.0) | 64 (2.38) | 38 (1.41) | 168 (6.25) | 176 (6.55) | ||
| 3+ | 2,235 (91.3) | 56 (2.28) | 28 (1.14) | 132 (5.39) | 155 (6.32) | ||
| Smoking status | |||||||
| Yes | 6,348 (89.6) | 84 (2.31) | 33 (0.91) | 463 (6.54) | 0.12 | 292 (8.02) | 0.05 |
| No | 3,286 (90.2) | 172 (2.43) | 101 (1.43) | 240 (6.59) | 495 (6.99) | ||
| Family history of asthma | |||||||
| Yes | 394 (76.7) | 37 (7.20) | 26 (4.68) | 55 (10.7) | <0.001 | 66 (12.0) | <0.001 |
| No | 9,736 (90.5) | 231 (2.15) | 113 (1.05) | 680 (6.32) | 763 (7.09) | ||
| Family history of eczema and/or hay fever | |||||||
| Yes | 397 (71.5) | 24 (4.32) | 26 (4.69) | 108 (19.5) | <0.001 | 57 (10.3) | <0.001 |
| No | 9,733 (90.8) | 244 (2.28) | 115 (1.07) | 627 (5.85) | 772 (7.20) | ||