Table 2. Intention-to-treat results for primary and secondary outcomes in the trial.

Continuous outcome	Intervention (n=37)		Control (n=34)		Analysis
	Mean	S.d.	Mean	S.d.	ta	d	95% CI for d
Primary outcome, 1 week
Number of intrusive memories of traumatic event	8.73	11.55	23.26	32.99	2.80**	0.67	0.18, 1.14
Secondary outcomes, 1 week
Impact of Event Scale—Revised
Intrusion subscale	7.27	5.27	10.70	7.29	2.25*	0.54	0.06, 1.01
Avoidance subscale	7.69	8.11	8.07	7.90	0.26	0.06	−0.41, 0.53
Hyperarousal subscale	5.26	5.79	6.98	7.42	0.96	0.23	−0.24, 0.70
Total	20.85	19.92	25.73	21.21	1.11	0.26	−0.21, 0.73
Post-traumatic Diagnostic Scale	11.38	8.55	14.28	11.94	0.83	0.20	−0.27, 0.67
Hospital Anxiety and Depression Scale	7.96	6.27	9.83	8.43	0.61	0.15	−0.32, 0.61
Secondary outcomes, 1 month
Impact of Event Scale—Revised
Intrusion subscale	5.21	5.09	7.01	6.90	0.93	0.22	−0.25, 0.69
Avoidance subscale	4.80	6.21	4.87	6.64	0.01	0.00	−0.47, 0.47
Hyperarousal subscale	4.29	6.47	5.28	6.45	0.59	0.14	−0.33, 0.61
Total	14.47	15.09	17.32	20.39	0.46	0.11	−0.36, 0.58
PDS	9.54	9.20	10.21	11.26	0.29	0.07	−0.40, 0.54
Hospital Anxiety and Depression Scale	7.44	7.20	8.12	8.20	0.18	0.04	−0.42, 0.51
Categorical outcome, 1 month	n	%	n	%	βb	OR	95% CI for OR
PDS symptoms consistent with PTSD criteria	4	12.9	3	9.7	0.34	1.4	0.28, 7.09

Abbreviations: CI, confidence interval; OR, odds ratio; PDS, Post-traumatic Diagnostic Scale; PTSD, post-traumatic stress disorder.

*P<0.05; **P<0.01.

^ad.f.=69.

^bLogistic regression, d.f.=1.