Table 1.
Personal and secondhand smoke exposure characteristics of nonsmoking adolescent girls by group allocation.
| Characteristic | Control, n (%) (n=376) |
Intervention, n (%) (n=242) |
Total, n (%) (n=618) |
P valuea | ||
| Demographics |
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Age in years (at follow-up) |
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13 | 20/376 (5.3) | 5/242 (2.1) | 25/618 (4.0) | <.001 |
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14 | 157/376 (41.8) | 56/242 (23.1) | 213/618 (34.5) |
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15 | 199/376 (52.9) | 181/242 (74.8) | 380/618 (61.5) |
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Ethnicity (at baseline) |
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Aboriginal | 27/372 (7.3) | 22/237 (9.3) | 49/605 (8.1) | .50 |
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Non-Aboriginal | 343/370 (92.7) | 215/237 (90.7) | 558/608 (91.8) |
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Family income (at baseline) |
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Below average | 24/348 (6.9) | 7/233 (3.0) | 31/574 (5.4) | .04 |
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Average | 280/348 (80.5) | 183/231 (79.2) | 463/579 (80.0) |
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Above average | 44/349 (12.6) | 41/231 (17.7) | 85/578 (14.7) |
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Responded “Yes” to “Family history of breast cancer” (at baseline) | 66/357 (18.5) | 64/236 (27.1) | 130/591 (22.0) | .02 | |
| SHS exposure |
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Responded “Yes” to “Parent(s) smoke(s)” (at follow-up) |
101/338 (29.9) | 40/223 (17.9) | 141/562 (25.1) | .001 | |
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Responded “Yes” to “Friends smoke” (at follow-up) | 57/295 (19.3) | 27/191 (14.1) | 84/488 (17.2) | .18 | |
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Answered “Yes” to “Does anyone smoke in your home every day or almost every day?” (at follow-up) | 41/363 (11.3) | 17/239 (7.1) | 58/604 (9.6) | .12 | |
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Past month’s exposure to SHS (at follow-up) | |||||
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Every day | 16/372 (4.3) | 5/238 (2.1) | 21/600 (3.5) | .60 |
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Almost every day | 38/368 (10.1) | 27/237 (11.4) | 65/607 (10.7) |
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At least once a week | 103/369 (27.9) | 68/236 (28.8) | 171/604 (28.3) |
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At least once in past month | 166/369 (45.0) | 111/236 (47.0) | 227/495 (45.8) |
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Never | 46/368 (12.5) | 25/236 (10.6) | 71/607 (11.7) |
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| Other characteristics |
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Intentions to try smoking in future (at baseline) | |||||
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Probably yes | 16/363 (4.4) | 5/238 (2.1) | 24/585 (4.1) | .71 |
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Probably not | 73/361 (20.2) | 47/238 (19.7) | 102/586 (17.4) |
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Definitely not | 272/361 (75.3) | 185/238 (77.7) | 459/585 (78.5) |
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Time elapsed to follow-up, months (SD) | 5.82 (0.77) | 5.84 (1.10) | 5.83 (0.94) | .77b | |
aBased on Fischer’s exact test.
bBased on independent samples t test.