Table 1.

Simulation study results.

Metric, simulation type, and attrition severity			Location of phase transition	3% user-specified threshold	GLMMa	DTSAb
Type I error
	Constant
		Mild	—c	0.19	0.01	0.74
		Severe	—c	0.53	0.98	0.96
Sensitivity
	Two phases
		Mild	Middle	0.47	0.22	0.90
		Mild	Start	0.48	0.17	0.94
		Mild	End	0.72	0.13	0.87
		Mild reverse	Middle	0.44	0.20	0.64
		Mild reverse	Start	0.51	0.01	0.69
		Mild reverse	End	0.41	0.14	0.58
		Severe	Middle	0.82	0.24	0.91
		Severe	Start	0.79	0.20	0.97
		Severe	End	0.90	0.56	0.88
		Severe reverse	Middle	0.88	0.02	0.58
		Severe reverse	Start	0.90	0.01	0.69
		Severe reverse	End	0.88	0.00	0.50
	Three phases
		Mild	Middle	0.67	0.12	0.08
		Mild	1 start	0.96	0.32	0.07
		Mild	1 end	0.96	0.35	0.05
		Mild	Ends	0.96	0.51	0.03
		Severe	Middle	0.98	0.84	0.08
		Severe	1 start	0.96	0.99	0.07
		Severe	1 end	0.96	0.99	0.06
		Severe	Ends	0.94	0.99	0.04

^aGLMM: generalized linear mixed model.

^bDTSA: discrete time survival analysis.

^cNot applicable in the case of constant attrition.