From: Evaluation of the impact of disease prevention measures: a methodological note on defining incidence rates
Trial arm
Sample size
Number of events
Person-year at riska
Event/PYAR
Event/observation timeb
Control
98
760
109.3
6.953
5.490
SP
725
107.8
6.725
5.347
TS
99
609
116.8
5.214
4.346
DP
366
121.3
3.017
2.704
Overall
393
2460
455.2
5.404
4.477