Appendix 7.

Non-overlapping versus Overlapping Depression and PTS Associated with Oil Spill Response and Clean-up Experiences (Workers Only)

	Prevalence Ratio* (95% CI**)
Predictor	Depression without PTS† (N=5,804) n=816 with Depression		PTS without Depression† (N=5,100) n=112 with PTS		PTS with Depression† (N=5,236) n=248 with both
Smelled oil, dispersants, or cleaning chemicals	1·47	(1·27, 1·70)	2·09	(1·26, 3·46)	2·57	(1·82, 3·62)
Skin/clothing in contact with oil/tar/oily water	1·09	(0·93, 1·28)	1·59	(0·92, 2·74)	0·94	(0·67, 1·32)
Had to stop working due to heat	1·35	(1·19, 1·53)	1·13	(0·77, 1·65)	1·84	(1·41, 2·40)
Job involving oily wildlife/plants/animals	0·91	(0·80, 1·04)	0·81	(0·54, 1·21)	1·22	(0·94, 1·57)
Body/clothing ever became wet with chemicals	1·06	(0·93, 1·20)	1·40	(0·95, 2·08)	1·24	(0·96, 1·60)
Any self-reported work with dispersants	0·97	(0·82, 1·15)	0·78	(0·47, 1·27)	1·32	(1·01, 1·74)
Worked as a commercial fisherman	1·43	(1·23, 1·68)	2·61	(1·66, 4·13)	2·02	(1·48, 2·76)

^*Adjusted for age, sex, race, annual household income, marital status, employment status, financial worries, displaced by Hurricanes Isaac or Katrina, mental health diagnosis prior to the spill, other oil industry experience, duration of clean-up work, TH exposure level.

^†Reference group has neither depression nor PTS symptoms.

^**CI denotes confidence interval.