Table 2.
Relative difference in sleep indicators between groups at 3-month follow-up
| Sleep measure | Baseline mean (SD) | 12-week follow-up mean (SD) | Unadjusted difference β (95 % CI)a | P-value | Adjusted difference β (95 % CI)b | P-value |
|---|---|---|---|---|---|---|
| Sleep quantity on work/school nights (hours/night) | ||||||
| Sleep/activity group | 5.82 (1.40) | 6.34 (1.41) | 0.306 (−0.155, 0.766) | 0.19 | 0.335 (−0.134, 0.805) | 0.16 |
| Smoking cessation group | 6.42 (1.44) | 6.39 (1.48) | ||||
| Sleep quantity on non-work/non-school nights (hours/night) | ||||||
| Sleep/activity group | 7.50 (2.14) | 7.93 (2.05) | 0.060 (−0.649, 0.769) | 0.87 | −0.023 (−0.724, 0.678) | 0.95 |
| Smoking cessation group | 8.32 (2.05) | 8.18 (1.95) | ||||
| Sleep quality scorec | ||||||
| Sleep/activity group | 17.52 (4.74) | 15.82 (4.61) | 0.074 (−1.529, 1.676) | 0.93 | 0.078 (−1.548, 1.705) | 0.92 |
| Smoking cessation group | 17.00 (5.50) | 15.53 (4.80) | ||||
SD Standard deviation, CI Confidence interval
n = 116
aAdjusted for baseline sleep
bAdjusted for baseline sleep, change in physical activity, smoking status at follow-up, daily text messaging usage, sex, educational attainment, and race
cSleep quality was assessed using 8 self-report items adapted from the PSQI; scores were the sum of participants' quantified responses for each item, with higher scores being indicative of poorer sleep quality (possible scores ranged from 8 to 32)