Table. Baseline Participant Characteristics for Each Run-in Group and Each Sex × Group Condition.
| Characteristic | Participant groupa | |||||
|---|---|---|---|---|---|---|
| Men | Women | All | ||||
| Standard run-in (n = 68) | Extended run-in (n = 73) | Standard run-in (n = 89) | Extended run-in (n = 90) | Standard run-in (n = 157) | Extended run-in (n = 163) | |
| Age, mean (SD), y | 52.7 (10.9) | 53.2 (10.9) | 54.2 (9.3) | 54.2 (9.8) | 53.5 (10.0) | 53.8 (10.3) |
| Race | ||||||
| Black or African American | 10 (14.7) | 9 (12.3) | 24 (27.0) | 24 (26.7) | 34 (21.7) | 33 (20.2) |
| White | 55 (80.9) | 59 (80.8) | 63 (70.8) | 63 (70.0) | 118 (75.2) | 122 (74.8) |
| Otherb | 3 (4.4) | 5 (6.8) | 2 (2.2) | 3 (3.3) | 5 (3.2) | 8 (4.9) |
| Hispanic ethnicity | 2 (2.9) | 1 (1.4) | 2 (2.2) | 3 (3.3) | 4 (2.5) | 4 (2.5) |
| Educational level past high schoolc | 47 (72.3) | 47 (67.1) | 67 (77.0) | 68 (77.3) | 114 (75.0) | 115 (72.8) |
| Employed full-timed | 34 (52.3) | 33 (48.5) | 37 (42.5) | 38 (43.2) | 71 (46.7) | 71 (45.5) |
| Income ≥$50 000e | 39 (63.9) | 40 (60.6) | 43 (51.8) | 40 (49.4) | 82 (56.9) | 80 (54.4) |
| Married or living with partnerf | 37 (57.8) | 41 (57.8) | 47 (54.0) | 45 (51.7) | 84 (55.6) | 86 (54.4) |
| BMI, mean (SD) | 30.9 (5.7) | 30.3 (6.3) | 31.1 (8.0) | 29.7 (6.7) | 31.0 (7.1) | 30.0 (6.5) |
| Body weight, mean (SD), kg | 96.2 (20.1) | 93.8 (22.5) | 83.5 (23.2) | 79.0 (18.4) | 89.0 (22.7) | 85.7 (21.6) |
| Age first smoked daily, mean (SD), y | 18.7 (3.6) | 17.9 (3.6) | 18.5 (3.5) | 18.8 (3.5) | 18.6 (3.6) | 18.4 (3.6) |
| Duration of daily smoking, mean (SD), y | 33.7 (11.4) | 35.1 (11.2) | 35.8 (9.5) | 35.3 (9.7) | 34.9 (10.4) | 35.2 (10.3) |
| CPD in past 6 mo, mean (SD) | 20.3 (8.1) | 19.5 (8.0) | 17.0 (6.2) | 16.5 (6.1) | 18.4 (7.3) | 17.9 (7.2) |
| FTCD score, mean (SD)g | 5.5 (2.2) | 5.5 (1.8) | 5.6 (1.9) | 5.4 (2.1) | 5.6 (2.0) | 5.4 (2.0) |
| Smokes menthol cigarettesh | 25 (39.1) | 25 (35.2) | 50 (57.5) | 55 (62.5) | 75 (49.7) | 80 (50.3) |
| Lives with another smokeri | 16 (32.7) | 14 (29.8) | 23 (33.8) | 30 (47.6) | 39 (33.3) | 44 (40.0) |
| Expired-air CO level, mean (SD), ppm | 27.7 (14.0) | 28.4 (12.7) | 27.1 (15.6) | 28.1 (13.2) | 27.4 (14.9) | 28.2 (13.0) |
| Salivary cotinine level, mean (SD), ng/mL | 308.8 (169) | 319.8 (172) | 314.0 (160) | 305.6 (146) | 311.8 (164) | 312.0 (158) |
| NMR, mean (SD) | 0.42 (0.32) | 0.47 (0.34) | 0.52 (0.50) | 0.62 (0.42) | 0.48 (0.43) | 0.55 (0.39) |
| No. of prior quit attempts, mean (SD) | 4.2 (3.2) | 4.6 (3.3) | 4.6 (3.2) | 4.1 (3.0) | 4.4 (3.2) | 4.4 (3.1) |
| Longest quit duration >8 wkj | 37 (56.9) | 35 (49.3) | 51 (58.6) | 53 (60.2) | 88 (57.9) | 88 (55.3) |
Abbreviations: BMI, body mass index (calculated as weight in kilograms divided by height in meters squared); CO, carbon monoxide; CPD, cigarettes per day; FTCD, Fagerstrom Test of Cigarette Dependence; NMR, nicotine metabolite ratio.
Unless otherwise indicated, data are expressed as No. (%) of participants. To convert cotinine level to nmol/L, multiply by 5.675.
Includes American Indian or Alaska Native, more than 1 race or ethnicity, and other race or ethnicity.
Data were missing for 10 of 320 participants (3.1%).
Data were missing for 12 of 320 participants (3.8%).
Data were missing for 29 of 320 participants (9.1%).
Data were missing for 11 of 320 participants (3.4%).
Scores range from 0 to 10, with higher scores indicating greater dependence on cigarettes.
Data were missing for 10 of 320 participants (3.1%).
Data were missing for 93 of 320 participants (29.1%). This variable was added partway through the study.
Data were missing for 9 of 320 participants (2.8%).