Table 4.
Results of the primary regression model by a negative binomial regression approach
| 8 am to 10 pm (N=249) |
Model
|
With interaction
|
||||
|---|---|---|---|---|---|---|
| IRR | 95% CI | P-value | IRR | 95% CI | P-value | |
| Wearing time (DN vs day only) | 0.63 | 0.45–0.87 | 0.005 | 0.59 | 0.37–0.94 | 0.024 |
| SPC vs none | 0.80 | 0.57–1.10 | 0.168 | 0.75 | 0.47–1.19 | 0.219 |
| Interaction (DN by SPC) | – | – | – | 1.13 | 0.712 | |
Note: Dependent variable: difference between the maximal possible adherence (98 hours for 7 consecutive days) and the observed adherence (based on wearing time from 8 am until 10 pm).
Abbreviations: CI, confidence interval; DN, day and night; IRR, incidence rate ratio; SPC, supportive phone calls.