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Table 1 The denominators of incidence rate as defined in some references

From: Evaluation of the impact of disease prevention measures: a methodological note on defining incidence rates

Source Denominator
Hennekens and Buring ([1], p.57) “total person-time of observation”
Smith and Morrow ([2], p.306) “person-time-at-risk”
Greenland and Rothman ([3], p.34) “time spent in population”
Porta ([4], online version]) “number of person-time units at risk”