Table 2. Impact of the Intervention on Primary and Secondary Outcomes at 3 and 6 Months Post Baseline: Intervention to Promote Smoke-Free Homes Among 2-1-1 Callers, North Carolina, 2013.
| 3 month assessment | 6 month assessment | ITT Analysis Intervention group change1 | ||||||
|---|---|---|---|---|---|---|---|---|
| Intervention | Control | p-value | Intervention | Control | p-value | Effect | p-value | |
| (n = 205), | (n = 207), | (n = 190), | (n = 190), | |||||
| No. (%) or | No. (%) or | No. (%) or | No. (%) or | |||||
| Mean ±SD | Mean ±SD | Mean ±SD | Mean ±SD | |||||
| Primary outcome | ||||||||
| Home smoking ban | ||||||||
| Full ban | 78 (38.1) | 40 (19.3) | < .001 | 82 (43.2) | 63 (33.2) | .02 | 1.31 | .001 |
| No full ban | 127 (62.0) | 167 (80.7) | 108 (56.8) | 127 (66.8) | ||||
| Partial ban | 76 (37.1) | 101 (48.8) | < .0001 | 74 (39.0) | 72 (37.9) | .04 | 1.34 | .002 |
| No ban | 51 (24.9) | 66 (31.9) | 34 (17.9) | 55 (29.0) | ||||
| Secondary outcomes—all participants | ||||||||
| No. of days exposed to SHS in past 7 days | 2.5 ±2.96 | 3.4 ±3.10 | .002 | 2.1 ±2.87 | 2.9 ±3.12 | .006 | -0.35 | .0004 |
| Car smoking ban2 | .33 | .053 | 1.22 | .03 | ||||
| Full ban | 61 (29.8) | 49 (23.7) | 72 (37.9) | 47 (25.3) | ||||
| Partial ban | 64 (31.2) | 65 (31.4) | 40 (21.1) | 52 (27.4) | ||||
| No ban | 40 (19.5) | 49 (23.7) | 39 (20.5) | 39 (20.5) | ||||
| No car | 40 (19.5) | 44 (21.2) | 39 (20.5) | 51 (26.8) | ||||
| Talked about SFH3 | 3.0 ±1.05 | 2.7 ±1.12 | .01 | 3.0 ±1.03 | 2.8 ±1.16 | .04 | N/A4 | N/A4 |
| Secondary outcomes—smokers only | ||||||||
| Smokers | (n = 139) | (n = 165) | (n = 119) | (n = 142) | ||||
| Quit attempts last 3 months | 1.4 ±2.1 | 0.8 ±1.2 | .01 | 2.1 ±1.7 | 1.8 ±1.1 | .61 | 1.19 | .09 |
| No. of cigarettes per day | 10.8 ±7.8 | 12.1 ±7.7 | .16 | 9.7 ±7.3 | 10.9 ±7.5 | .19 | -0.62 | .03 |
| Confidence to quit smoking | 6.7 ±2.6 | 6.0 ±2.8 | .03 | 6.7 ±2.7 | 6.3 ±2.8 | .22 | 0.24 | .02 |
1ITT analyses are growth models that include data from all participants including those who were not reached for 3 months and/or 6 months follow-up. Effect sizes and p-values reported are those from the cross-level interaction effect between time and group assignment. Effect for full and partial ban is an odds ratio, for exposure to SHS and quit attempts is event rate ratio, and beta for the other outcomes.
2No car excluded from analysis.
3On a scale from 1 = never to 4 = very often.
4 N/A because not assessed at baseline.