4. Intensity of intervention meta‐regression analysis ‐ frequency of contact in intervention.
Group | Mean ES | ‐95% CI | +95% CI | P | N |
1 | 1.89 | 1.24 | 2.89 | .03 | 8 |
2 | 1.11 | 0.86 | 1.43 | .41 | 15 |
3 | 1.73 | 0.21 | 22.48 | .003 | 8 |
4 | 1.23 | 1.01 | 1.51 | .04 | 18 |
5 | 1.36 | 1.00 | 1.84 | .05 | 10 |
6 | 1.38 | 1.19 | 1.60 | .00 | 37 |
1 = Single contact during/at time of routine pregnancy care visits (but not ‘usual care’) without strategies to quit; 2 = Single contact, outside of ‘routine’ pregnancy care with strategies to quit; 3 = 2‐5 contacts to sustain motivation to stop smoking provided during/at time of routine pregnancy care visits; 4 = 2‐5 contacts to sustain motivation to stop smoking provided outside of routine care; 5 = > 5 contacts to sustain motivation to stop smoking provided during/at time of routine care visits; 6 = > 5 contacts to sustain motivation to stop smoking provided outside of routine care. 1 study, Campbell 2006, was treated as missing from this analysis as the intervention frequency was unclear.