Appendix Table 2.

Data From a Hypothetical Randomized Trial Under the Principal Stratification

	Treatment Group			Placebo Group
	Always Survivor	Never Survivor	Complier	Always Survivor	Never Survivor	Complier
No. overall	50	20	30	50	20	30
No. of survivors	50	0	30	50	0	0
No. of survivors with high QOL	35	Undefined	5	10	Undefined	Undefined

Abbreviation: QOL, quality of life.