Table. Participant Characteristics.
| Characteristic | All Enrolled Participants (n = 297) | Participants Lost Prior to Randomization (n = 59) | All Randomized Participants (n = 238) | P Valuea | NNCC Group (n = 120) | VLNCC Group (n = 118) | P Valueb |
|---|---|---|---|---|---|---|---|
| Demographics | |||||||
| Age, mean (SD), y | 38.2 (13.8) | 39.6 (13.8) | 37.9 (13.8) | .38 | 38.4 (14.2) | 37.4 (13.5) | .56 |
| Men, No. (%) | 135 (45.5) | 27 (45.5) | 108 (45.4) | .96 | 49 (40.8) | 59 (50.0) | .16 |
| Race/ethnicity, No. (%) | |||||||
| White | 181 (60.9) | 29 (49.1) | 152 (63.9) | .01 | 76 (63.3) | 76 (64.4) | .41 |
| Black | 88 (29.6) | 27 (45.8) | 61 (25.6) | 34 (28.3) | 27 (22.9) | ||
| Other | 28 (9.4) | 3 (5.1) | 25 (10.5) | 10 (8.3) | 15 (12.7) | ||
| Hispanic | 16 (5.4) | 3 (5.2) | 13 (5.5) | .93 | 6 (5.0) | 7 (5.9) | .75 |
| Education, No. (%) | |||||||
| ≤High school | 70 (23.6) | 23 (37.9) | 47 (19.7) | <.01 | 27 (22.5) | 20 (17.0) | .41 |
| Some college | 115 (38.7) | 22 (37.9) | 93 (39.1) | 48 (40.0) | 45 (38.1) | ||
| ≥Bachelor’s degree | 112 (37.7) | 14 (24.2) | 98 (41.2) | 45 (37.5) | 53 (44.9) | ||
| Annual income, mean (SD), $c | 27 669 (23 180) | 24 353 (24 707) | 28 481 (22 772) | .22 | 29 042 (23 715) | 27 906 (21 849) | .70 |
| Smoking at enrollment | |||||||
| Cigarettes per day, mean (SD)d | 2.0 (1.8) | 2.5 (2.1) | 1.9 (1.7) | .02 | 1.9 (1.7) | 1.9 (1.6) | .90 |
| Days smoking, mean (SD), wkd | 3.8 (1.4) | 4.1 (1.4) | 3.7 (1.4) | .05 | 3.7 (1.4) | 3.7 (1.4) | .91 |
| No. of cigarettes per d, on smoking days, mean (SD)d | 3.5 (2.7) | 4.1 (3.1) | 3.4 (2.6) | .09 | 3.5 (2.9) | 3.3 (2.3) | .67 |
| Smoke menthol, No. (%) | 158 (53.2) | 38 (64.4) | 120 (50.4) | .05 | 62 (51.7) | 58 (49.2) | .70 |
| Time smoked, mean (SD), y | 16.9 (12.2) | 17.5 (11.9) | 16.8 (12.3) | .69 | 17.9 (12.4) | 15.7 (12.1) | .16 |
| Past daily smoker, No. (%) | 144 (48.7) | 26 (44.8) | 118 (49.6) | .52 | 61 (50.8) | 57 (48.3) | .70 |
| FTND score of 0, No. (%)46 | 200 (68.0) | 23 (39.7) | 177 (75.0) | <.001 | 94 (79.0) | 83 (70.9) | .15 |
Abbreviations: FTND, Fagerstrom Test for Nicotine Dependence; NNCC, normal-nicotine-content cigarettes; VLNCC, very low-nicotine-content cigarettes.
a
Comparison between randomized and nonrandomized groups. χ2 Test for categorical variables, and t test for continuous variables.
b
Comparison between VLNCC and NNCC groups. χ2 Test for categorical variables, and t test for continuous variables.
c
Uses midpoints from 12 categories from less than $5000 to more than $80 000.
d
Timeline follow-back reporting (28 days).