Table 3.

Types of Irregularity According to Data to be Collected

	Data Intended to be Recorded
Type of Irregularity	Outcome and Baseline Covariates	Outcome, Baseline, and Auxiliary Covariates
ACAR	Assessment process is independent of the underlying outcome process and baseline covariates.	Assessment process is independent of the underlying outcome process, underlying auxiliary covariate process, and baseline covariates.
ACAR-X	Assessment process is conditionally independent of the underlying outcome process, given baseline covariates.	Assessment process is conditionally independent of the underlying outcome process and underlying auxiliary covariate process, given baseline covariates.
AAR	Assessment at any given time is conditionally independent of the underlying outcome at that time, given past observed outcomes, past assessment history, and baseline covariates.	Assessment at any given time is conditionally independent of the outcome at that time, given past observed outcomes, past assessment history, and past observed covariates (auxiliary and baseline).
ANAR	Assessment at any given time is not conditionally independent of the underlying outcome at that time, given past observed outcomes, past assessment history, and baseline covariates.	Assessment at any given time is not conditionally independent of the outcome at that time given past observed outcomes, past assessment history, and past observed covariates (auxiliary and baseline).

Abbreviations: AAR, assessment at random; ACAR, assessment completely at random; ACAR-X, assessment completely at random with baseline covariates; ANAR, assessment not at random.