Table 1.
Baseline characteristics of participants from an online smoking cessation triala
| Study sample (n=3056) | Lost to follow-up (n=4518) | |
|---|---|---|
| Spanish, n (%) | 1980 (64.8) | 3063 (67.8)* |
| Female, n (%) | 1622 (53.1) | 2125 (47.0)*** |
| Married or living with partner, n (%) | 1770 (58.0) | 2599 (57.6) |
| History of MDE, n (%) | 553 (18.1) | 764 (16.9) |
| Antidepressants at baseline, n (%) | 284 (9.3) | 357 (7.9)* |
| Race, n (%) | 3036 | 4488 |
| European descent/white | 2241 (73.8) | 3219 (71.7) |
| Mestizo | 372 (12.3) | 595 (13.3) |
| Asian descent | 129 (4.2) | 218 (4.9) |
| African descent | 35 (1.2) | 64 (1.4) |
| Native peoples of the Americas/Pacific | 4 (0.1) | 16 (0.4) |
| Other/more than one race | 254 (8.4) | 377 (8.4) |
| Education, n (%) | 3049 | 4501*** |
| High school or less | 546 (17.9) | 953 (21.2) |
| Some college | 1055 (34.6) | 1688 (37.5) |
| Bachelors completed | 968 (31.7) | 1288 (28.6) |
| Masters or higher completed | 480 (15.7) | 572 (12.7) |
| Condition, n (%) | 3056 | 4518*** |
| Basic intervention | 870 (28.5) | 1035 (22.9) |
| Plus reminder emails | 773 (25.3) | 1132 (25.1) |
| Plus mood management | 721 (23.6) | 1162 (25.7) |
| Plus virtual group | 692 (22.6) | 1189 (26.3) |
| Times quit in past year, n (%) | 3055 | 4515 |
| None | 1199 (39.2) | 1843 (40.8) |
| One to two times | 951 (31.2) | 1417 (31.4) |
| Three to five times | 577 (18.9) | 823 (18.2) |
| Six or more times | 328 (10.7) | 432 (9.2) |
| Mean age, years (S.D.) | 38.8 (11.0) | 36.0 (10.5)*** |
| Mean age of first cigarette, years (S.D.) | 15.6 (3.2) | 15.6 (3.3) |
| Mean age of regular smoking, years (S.D.) | 18.6 (4.3) | 18.4 (4.0)*** |
| Mean years smoked (S.D.) | 23.2 (11.3) | 20.5 (10.8)*** |
| Mean smoking rate, cigarettes/week (S.D.) | 19.2 (9.7) | 20.0 (9.8)*** |
| Mean Fagerstrom score (S.D.) | 5.0 (2.5) | 5.3 (2.5)*** |
| Mean CES-D at baseline (S.D.) | 12.0 (8.5) | 12.3 (8.4) |
MDE, Major depressive episode; S.D., standard deviation; CES-D, Center for Epidemiological Studies – Depression Scale.
Values are given as number of participants (percentage) or mean (S.D.).
a
Baseline characteristics were compared by Pearson χ2 and t tests.
Lost to follow-up participants differed from the study sample:
*
p≤0.05,
***
p≤0.001.