Table 1.
Demographic/baseline characteristics of participants in the SMS USA study (overall and by intervention assignment)
| Overall (n = 116) | Smoking cessation group (n = 72) | Sleep/activity group (n = 44) | P-value | |
|---|---|---|---|---|
| Demographic/baseline characteristics | ||||
| N (%) | ||||
| Sex | ||||
| Male | 61 (52.6) | 40 (55.6) | 21 (47.7) | 0.45 |
| Female | 55 (47.4) | 32 (44.4) | 23 (52.3) | |
| Race | ||||
| White or Caucasian | 78 (67.2) | 47 (65.3) | 31 (70.5) | 0.68 |
| Other | 38 (32.8) | 25 (34.7) | 13 (29.5) | |
| Educational attainment | ||||
| High school or less/post-sec non-completer | 24 (20.7) | 13 (18.1) | 11 (25.0) | 0.48 |
| Currently enrolled in post-sec/post-sec completer | 92 (79.3) | 59 (81.9) | 33 (75.0) | |
| Median (25 %, 75 % quartile) | ||||
| Daily text messaging usage | 50 (20, 100) | 50 (20, 100) | 43.5 (18.5, 100) | 0.46 |
| Mean (SD) | ||||
| Sleep quantity on work/school nights (hours) | 6.19 (1.45) | 6.42 (1.44) | 5.82 (1.40) | 0.03* |
| Sleep quantity on non-work/non-school nights (hours) | 8.01 (2.11) | 8.32 (2.05) | 7.50 (2.14) | 0.04* |
| Sleep quality score | 17.20 (5.21) | 17.00 (5.50) | 17.52 (4.74) | 0.60 |
| Physical activity (hours/week) | 5.70 (6.58) | 6.38 (7.41) | 4.59 (4.82) | 0.16 |
*Significant at p < 0.05