characteristics of the participants by childhood secondhand smoke exposure at home before and after PSM
| Number (%) | Childhood home exposure (before PSM) | Childhood home exposure (after PSM) | |||||
|---|---|---|---|---|---|---|---|
| Total N=19 562 | Yes (n=11 096) | None (n=8466) | p | Yes (n=7782) | None (n=7782) | p Value | |
| Age (years) | <0.001 | 0.50 | |||||
| 50–59 | 10 025 (51.3) | 6502 (58.6) | 3523 (41.6) | 3555 (45.7) | 3522 (45.3) | ||
| 60–69 | 7184 (36.7) | 3618 (32.6) | 3566 (42.1) | 3267 (42.0) | 3333 (42.8) | ||
| ≥70 | 2353 (12.0) | 976 (8.8) | 1377 (16.3) | 960 (12.3) | 927 (11.9) | ||
| Education | <0.001 | 0.68 | |||||
| ≤Primary school | 9157 (46.8) | 4981 (44.9) | 4176 (49.3) | 3711 (47.7) | 3691 (47.4) | ||
| Middle school | 9232 (47.2) | 5510 (49.7) | 3722 (44.0) | 3566 (45.8) | 3559 (45.7) | ||
| ≥College | 1173 (6.0) | 605 (5.5) | 568 (6.7) | 505 (6.5) | 532 (6.8) | ||
| Past occupational dust exposure | <0.001 | 0.20 | |||||
| Yes | 936 (4.8) | 613 (5.5) | 323 (3.8) | 346 (4.4) | 314 (4.0) | ||
| None | 18 626 (95.2) | 10 483 (94.5) | 8143 (96.2) | 7436 (95.6) | 7468 (96.0) | ||
| Past home fuel exposure | 0.49 | <0.001 | |||||
| Yes | 9405 (48.1) | 5311 (47.9) | 4094 (48.4) | 4056 (52.1) | 3720 (47.8) | ||
| None | 10 157 (51.9) | 5785 (52.1) | 4372 (51.6) | 3726 (47.9) | 4062 (52.2) | ||
| Oral contraceptive | <0.001 | 0.001 | |||||
| Yes | 3539 (18.1) | 2152 (19.4) | 1387 (16.4) | 1490 (19.1) | 1334 (17.1) | ||
| None | 16 023 (81.9) | 8944 (80.6) | 7079 (83.6) | 6292 (80.9) | 6448 (82.9) | ||
| Adulthood home exposure | <0.001 | 0.70 | |||||
| Yes | 4182 (21.4) | 2026 (18.3) | 2156 (25.5) | 1750 (22.5) | 1730 (22.2) | ||
| None | 15 380 (78.6) | 9070 (81.7) | 6310 (74.5) | 6032 (77.5) | 6052 (77.8) | ||
| Childhood home exposure | |||||||
| None | 8466 (43.3) | 7782 (100.0) | 7782 (100.0) | ||||
| Yes | 11 096 (56.7) | ||||||
| Number of home smokers | |||||||
| One | 8504 (43.5) | 8504 (76.6) | 5938 (76.3) | ||||
| Two or more | 2592 (13.3) | 2592 (23.4) | 1844 (23.7) | ||||
| Frequency of exposure | |||||||
| <5 times/week | 2790 (14.3) | 2790 (25.1) | 1925 (24.7) | ||||
| ≥5 times/week | 8306 (42.5) | 8306 (74.9) | 5857 (75.3) | ||||
PSM, propensity score matching.