Table 2 Negative-binomial generalised linear mixed model (GLMM) results for the primary analysis of the primary outcome (N = 1728, 72 sites)
Variable | Rate ratio | 95% confidence interval | p value |
|---|---|---|---|
Intervention (reference category: control condition) | 1.06 | 0.55 to 2.03 | 0.870 |
Time since start of study (per month) | 0.98 | 0.93 to 1.02 | 0.336 |
December/January (reference category: any other month) | 0.55 | 0.288 to 1.05 | 0.071 |
Site location in Scotland (reference category: location in England or Wales) | 2.00 | 0.96 to 4.2 | 0.063 |