Assertion: mantle's number | /r/HasProperty | the person-time
Facets:
value: for exposed and unexposed groups
type: TRANSITIVE-OBJECT
value: for each stratum
type: OTHER
value: respectively
type: MANNER
Source sentences:
text: Where for each stratum, a i = number of exposed cases, ci=number of unexposed cases, PTei and PT0i are the person-time for exposed and unexposed groups respectively, and PT Ti is the total person-time in each stratum.