Table 1

Missing data patterns

		Proportion with missing data on delta-V
		Restrained		Not restrained
Missing data pattern	True delta-V	Deaths	Survivors	Deaths	Survivors
*See text.
Missing completely at random	High	0.40	0.40	0.40	0.40
	Low	0.40	0.40	0.40	0.40

Missing at random	High	0.37	0.53	0.61	0.48
	Low	0.37	0.53	0.61	0.48

Missing not at random*	High	0.32	0.48	0.56	0.43
	Low	0.42	0.58	0.66	0.53