Table 1.
Individual characteristics.
| Characteristics | PHASMO (n = 417) | CAROSS (n = 333) | p-value for Difference | Overall (n = 750) |
|---|---|---|---|---|
| Age, mean (SD) | 42.7 (9.8) | 51.4 (9.8) | <0.001 * | 46.6 (9.8) |
| Women, No. (%) | 181 (43.4) | 146 (43.8) | 0.90 † | 327 (43.6) |
| Education level, No. (%) ‡ | 0.09 § | |||
| 9 years | 49 (12.3) | 33 (10.6) | 82 (11.5) | |
| 12 years | 223 (55.9) | 209 (67.2) | 432 (60.9) | |
| 14 years | 72 (18.0) | 32 (10.3) | 104 (14.6) | |
| 16 years | 55 (13.8) | 37 (11.9) | 92 (13.0) | |
| No. cigarettes per day at baseline, median (IQ range) | 25 (20–30) | 20 (17–30) | <0.001 § | 22 (20–30) |
| Follow-up, No. (%) || | <0.001 | |||
| <20 weeks | 110 (26.4) | 0 (0.0) | 110 (14.7) | |
| 20–40 weeks | 25 (6.0) | 2 (0.6) | 27 (3.6) | |
| >40 weeks | 282 (67.6) | 331 (99.4) | 613 (81.7) | |
| Cumulative duration of abstinence, No. (%) | 0.50 ¶ | |||
| <20 weeks | 212 (50.8) | 174 (52.3) | 386 (51.5) | |
| 20–40 weeks | 50 (12.0) | 31 (9.3) | 81 (10.8) | |
| >40 weeks | 155 (37.2) | 128 (38.4) | 284 (37.7) | |
| Absolute weight gain, kg #, mean (SD) | 2.7 (3.6) | 2.4 (3.8) | 0.31 * | 2.6 (3.7) |
| Relative weight gain, %, mean (SD) | 3.8 (5.1) | 3.2 (5.0) | 0.11 * | 3.6 (5.0) |
Notes: Abbreviations: SD = standard deviation; IQ = interquartile. * t-test. † test for the difference between two proportions. ‡ n = 710 (40 missing values). § Mann-Whitney test. || n = 749 (1 missing value). ¶ Chi2 test. # Weight in kilograms (kg), multiply by 2.2 to convert to lbs.