. Author manuscript; available in PMC: 2019 Jun 6.

Published in final edited form as: Mil Med. 2014 Mar;179(3):285–293. doi: 10.7205/MILMED-D-12-00513

Table 3.

Estimated Cumulative Incidence of Sexual Assault During the Time of Gulf War I in Men who Applied for Department of Veterans Affairs PTSD Disability Benefits, Based on Different Non-Response Assumptions

Analysis Set	Analysis Method	Assumptions About Non-Response			Sexual Assault During the Time of Gulf War I
		At Item Level	At Survey Level	N	Estimated Cumulative Incidence (%)	95% CI
1	Unadjusted for Non-response	Ignorable; items are missing completely at random	Ignorable; surveys are missing completely at random	1,652	6.0	(5.0-7.3)
2	Multiple Imputation and Propensity ^31,32	Non-ignorable; items are not missing at random.	Ignorable; missing surveys are not related to military sexual assault status once other characteristics are controlled	2,415	7.3	(6.1-8.6)
3	Expectation-Maximization³³	Non-ignorable; items are not missing at random.	Non-ignorable; missing surveys are directly related to military sexual assault status	2,415	19.9	(19.2-20.7)
	Maximum Likelihood³⁴	Non-ignorable; items are not missing at random.	Non-ignorable; missing surveys are directly related to military sexual assault status	1,061	18.0	(5.0-51.9)
	Bayesian³⁵	Non-ignorable; items are not missing at random.	Non-ignorable; missing surveys are directly related to military sexual assault status	2,415	21.0	(20.0-22.0)

CI = Confidence Intervals