Intervention arm | Control arm | ||
---|---|---|---|
Number of clusters | 12 | 12 | |
Total deaths | 79 | 116 | |
Total person-years | 23226.5 | 23330.2 | |
Analysis based on individual level data | |||
Overall rate/1000 person years | 3.30 | 4.97 | |
Rate difference (per 1000 person-years) | −1.67 | ||
Rate ratio | 0.66 | ||
Analysis based on cluster summaries | |||
Mean of cluster rates | 3.7 | 4.6 | |
SD of cluster rates | 3.9 | 3.3 | |
Rate difference (per 1000 person-years) | −0.90 | ||
Rate ratio | 0.80 |