Table 3

Persistence of reactions to critical incidents and risk of high post-traumatic stress symptoms

	Total	High PTSD symptoms		RR^*	OR^†
	No	No	%	(95% CI)	(95% CI)
Physical reactions
None	95	6	6.3
Any	88	11	12.5	2.0 (0.8 to 5.1)	2.1 (0.7 to 6.0)
Not persisting after one night	169	11	15.9
Persisting after one night	14	6	42.9	6.6 (2.9 to 15.1)	10.8 (3.2 to 36.6)
Not persisting after 1 week	173	11	6.3
Persisting after 1 week	10	6	60.0	9.4 (4.4 to 20.3)	22.1 (5.4 to 90.0)
Distressing feelings
None	20	2	10.0
Any	162	14	8.6	0.9 (0.2 to 3.5)	0.9 (0.2 to 4.1)
Not persisting after one night	81	4	4.9
Persisting after one night	101	12	11.9	2.4 (0.8 to 7.2)	2.6 (0.8 to 8.4)
Not persisting after 1 week	114	5	4.4
Persisting after 1 week	68	11	16.2	3.7 (1.3 to 10.2)	4.2 (1.4 to 12.7)
Disturbed sleep
None	69	4	5.8
Any	117	13	11.1	1.9 (0.7 to 5.6)	2.0 (0.6 to 6.5)
Not persisting after one night	103	4	3.9
Persisting after one night	83	13	15.7	4.0 (1.4 to 11.9)	4.6 (1.4 to 14.7)
Not persisting after 1 week	149	6	4.9
Persisting after 1 week	37	11	29.7	7.4 (2.9 to 18.7)	10.1 (3.4 to 29.7)
Irritability
None	103	5	4.9
Any	82	13	15.9	3.3 (1.2 to 8.8)	3.7 (1.3 to 10.8)
Not persisting after one night	135	6	4.4
Persisting after one night	50	12	24.0	5.4 (2.1 to 13.6)	6.8 (2.4 to 19.3)
Not persisting after 1 week	161	9	5.6
Persisting after 1 week	24	9	37.5	6.7 (3.0 to 15.2)	10.1 (3.5 to 29.4)
Social withdrawal
None	87	5	5.7
Any	98	11	11.2	2.0 (0.7 to 5.4)	2.1 (0.7 to 6.2)
Not persisting after one night	132	6	4.5
Persisting after one night	53	10	18.9	7.9 (4.2 to 10.8)	4.9 (1.7 to 14.2)
Not persisting after 1 week	160	7	4.4
Persisting after 1 week	25	9	36.0	8.2 (3.4 to 20.1)	12.3 (4.0 to 37.5)

↵* Probability of high IES-R score when the reaction criterion occurs/Probability of high score when criterion does not occur.
↵† Probability of high IES-R score when the reaction criterion occurs/Probability of low IES-R score when the criterion occurs.