Appendix 6.

Association of Individual Oil Spill Exposures and Mental Health Outcomes in Expanded and Restricted Study Sample (Workers Only)

	Prevalence Ratio* (95% CI**)
Predictor	Depression		PTS
	Final Analysis Sample† (N=6,134)	All Participants†† (N=7,576)	Final Analysis Sample† (N=6,284)	All Participants†† (N=7,788)
Exposure Effect Estimate
TH exposure ≥ 3·0 ppm	1·44 (1·15, 1·81)	1·40 (1·15, 1·70)	2·61 (1·68, 4·05)	2·83 (1·93, 4·15)
TH exposure 1·00 – 2·99 ppm	1·32 (1·06, 1·63)	1·29 (1·08, 1·54)	1·63 (1·05, 2·51)	1·77 (1·22, 2·58)
TH exposure 0·3 – 0·99 ppm	1·31 (1·06, 1·60)	1·29 (1·09, 1·54)	1·29 (0·84, 1·98)	1·37 (0·94, 1·99)
TH exposure < 0·3 ppm (reference)	-	-	-	-
Job type	(N=6,215)	(N=7,613)	(N=6,366)	(N=7,825)
Response	1·44 (1·03, 2·00)	1·40 (1·09, 1·80)	1·70 (0·94, 3·06)	2·02 (1·25, 3·27)
Operations	1·71 (1·23, 2·36)	1·60 (1·25, 2·05)	1·69 (0·94, 3·03)	2·07 (1·29, 3·34)
Clean-up on water	1·36 (0·96, 1·91)	1·31 (1·01, 1·71)	0·91 (0·48, 1·75)	1·16 (0·68, 1·98)
Decontamination	1·45 (1·05, 2·01)	1·41 (1·10, 1·80)	1·23 (0·68, 2·21)	1·37 (0·83, 2·23)
Clean-up on land	1·32 (0·95, 1·85)	1·30 (1·01, 1·68)	0·92 (0·50, 1·72)	1·07 (0·63, 1·80)
Support work (reference)	-	-	-	-
Burning/Flaring	(N=6,215)	(N=7,477)	(N= 6,366)	(N=7,685)
Exposure to burning/flaring	1·07 (0·91, 1·26)	1·07 (0·92, 1·26)	1·37 (1·05, 1·80)	1·51 (1·18, 1·94)
No exposure (reference)	-	-	-	-