Table 1.
Demographic data of participants and non-participants at baseline 12 and 18 year follow-ups.
| Characteristics | During the First Year of Life | At 12 Years | At 18 Years | ||||
|---|---|---|---|---|---|---|---|
| Baseline Participants (n = 620) | Participants (n = 370) | Non-Participants (n = 250) | p | Participants (n = 434) | Non-Participants (n = 186) | p | |
| Female sex | 303 (48.9%) | 175 (47.3%) | 128 (51.2%) | 0.34 * | 215 (49.5%) | 88 (47.3%) | 0.61 * |
| Mother’s education | |||||||
| Primary | 50 (8.0%) | 24 (6.5%) | 26 (10.4%) | <0.05 # | 30 (7.0%) | 20 (10.5%) | <0.05 # |
| Secondary | 206 (33.2%) | 113 (30.5%) | 93 (37.2%) | 129 (29.7%) | 77 (41.4%) | ||
| University | 364 (58.7%) | 233 (63.0%) | 131 (52.4%) | 275 (63.3%) | 89 (47.8%) | ||
| Father’s education | |||||||
| Primary | 68 (11.0%) | 42 (11.4%) | 31 (12.5%) | <0.05 # | 24 (5.5%) | 30 (16.1%) | <0.05 # |
| Secondary | 172 (27.9%) | 125 (33.8%) | 65 (26.2%) | 113 (26.0%) | 61 (32.3%) | ||
| University | 377 (61.1%) | 268 (72.4%) | 152 (61.3%) | 233 (53.7%) | 92 (49.5%) | ||
| Parental smoking | 107 (17.5%) | 75 (20.3%) | 47 (19.1%) | 0.71 * | 63 (14.5%) | 44 (24.0%) | <0.05 * |
| Parent asthma | 379 (61.3%) | 233 (63.0%) | 146 (58.4%) | 0.25 * | 261 (60.0%) | 118 (63.4%) | 0.43 * |
| Living ≤150 m from a freeway or highway | 97 (16.0%) | 51 (13.8%) | 46 (18.4%) | 0.12 * | 64 (14.7%) | 33 (17.7%) | 0.35 * |
| Major road length within 150 m buffer | |||||||
| Median/m | 261 | 261 | 262 | – | 262 | 254 | – |
| Inter quartile range/m | 102 | 105 | 92 | – | 110 | 122 | – |
Test for differences between the two populations: z-test * and chi-square test #.