Table 1.
Participant characteristics by survey incentive level.
| Overall n = 356 |
$0 incentive n = 132 |
$25 incentive n = 127 |
$50 incentive n = 97 |
p-Valuea | |
|---|---|---|---|---|---|
| Demographic characteristicsb | |||||
| Age in years, median (IQR) | 37 (29–51) | 44 (32–56) | 32 (28–46) | 36 (28–47) | < 0.001 |
| Gender is female | 67% | 70% | 66% | 65% | 0.72 |
| Race is Whitec | 87% | 85% | 88% | 87% | 0.88 |
| Ethnicity is Hispanic | 7% | 4% | 8% | 9% | 0.30 |
| Smoking characteristicsb | |||||
| Abstinent at follow-upd | 32% | 39% | 28% | 28% | 0.08 |
a
Median age compared with Kruskal Wallis test. All other characteristics compared with 2 × 3 Fishers Exact test.
b
Missing data rates for each dichotomized variable were as follows: Age 26% missing, gender 6% missing, race 8% missing, ethnicity 6% missing, abstinence 0% missing. “Prefer not to answer” was treated as missing for all variables presented here.
c
Includes respondents who only selected “White”.
d
Proportion of survey respondents reporting 7-day abstinence at survey completion.