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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”