Table 1.
Sample demographic and smoking history characteristics and differences by attrition status.
| Study completers (n = 169) M (SD) |
Non-completers (n = 77) M (SD) |
Total sample (n = 246) M (SD) |
|
|---|---|---|---|
| Demographic | |||
| Age*** | 41.34 (12.92) | 35.51 (10.81) | 39.52 (12.57) |
| Gender (n; % male) | 110 (65.1%) | 58 (75.3%) | 168 (68.3%) |
| Ethnicity (n; % White) | 149 (88.2%) | 72 (93.5%) | 221 (89.8%) |
| Highest level of education** | |||
| High school/GED or less | 38 (22.5%) | 18 (23.4%) | 56 (22.8%) |
| Some college/technical training | 66 (39.1%) | 45 (58.4%) | 111 (45.1%) |
| College graduate or higher | 65 (38.5%) | 14 (18.2%) | 79 (32.1%) |
| Smoking history | |||
| Baseline daily cigarette consumption | 20.68 (5.53) | 21.53 (5.67) | 20.95 (5.58) |
| Baseline carbon monoxide (ppm) | 25.42 (11.26) | 24.35 (11.87) | 25.09 (11.44) |
| Years smoking*** | 24.83 (13.13) | 19.56 (11.04) | 23.18 (12.73) |
| Nicotine dependence (FTND; 0]–10) | 5.51 (1.83) | 5.42 (1.84) | 5.48 (1.83) |
| Randomization group (n; %) | |||
| Control (Preferred brand) | 60 (75.9%) | 19 (24.1%) | 79 |
| Stepdown (High-moderate-low) | 63 (75.0%) | 21 (25.0%) | 84 |
| Nonstepdown (collapsed) | 46 (55.4%) | 37 (44.6%) | 83 |
| Low-moderate-high | 8 (44.4%) | 10 (55.6%) | 18 |
| Low-high-moderate | 9 (52.9%) | 8 (47.1%) | 17 |
| Moderate-low-high | 11 (68.8%) | 5 (31.3%) | 16 |
| Moderate-high-low | 8 (50.0%) | 8 (50.0%) | 16 |
| High-low-moderate | 10 (62.5%) | 6 (37.5%) | 16 |
Note:
*
indicates significant difference at p < .05 level;
**
= p <.01;
***
= p < .001.