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Censored observations
when we don’t know the outcome for an individual by the end of the study period
Differential loss to follow-up
when the loss due to exposure status is different for the diseased and non-diseased ppl
OR
the loss due to disease status is different for the exposed and unexposed ppl
There is an interaction b/n exposure and disease in causing the loss —> akin to misclassification
Equal loss to follow-up
when the probability of loss to follow-up is the same for all exposure and disease categories
Loss to follow-up
when observation for an individual in a cohort ends before they develop the disease or before the end of the study period
Loss to follow-up unequal by exposure
When the loss to follow-up differs by exposure status but not by disease status conditional on exposure
A different proportion of exposed and unexposed are lost to follow-up, but the proportion lost to follow-up is equal for diseased and non-diseased groups within each exposure group
Loss to follow-up unequal by disease
When the loss to follow-up differs by disease status but not by exposure status conditional on disease
Exposure has no effect on who is and who is not lost to follow-up but disease status does does
Non-differential loss to follow-up
When there is loss to follow-up due to both exposure and disease, but independently
Loss due to exposure is the same for diseased and non-diseased ppl and the loss due to disease is the same for exposed and non-exposed individuals