Table 2.

Measurements of posttraumatic stress disorder symptoms, ordered by follow-up time

Study	Past psychiatric illness	Instrument	Follow-up in months	N at follow-up	Mean (sd) or Median (IQR) [Range] Score	Cut-off score	Point prevalence
Perrins et al. 1998 [10]	-	IES	1.5	44	14, 12	19	31%
			6	41	12, 12		32%
			12	38	12, 8		27%
Jones et al. 2001 [11]	18%	IES	2	30	16, 11	19	23%
Samuelson et al. 2007 [12]	-	IES-R	2	226	8(12), 3, [0–83]	30	8%
Jones et al. 2007 [13]	24%	PDS	3	238	-	DSM-IV criteria	9%
Cuthbertson et al. 2004 [14]	14%	DTS	3	78	8 [0–87]	27	22%
Jones et al. 2003 [15]	-	IES	2	63, 51 ^a, 114 ^b	20, 14 ^b	-	-
Jones et al. 2003 [15]	-	IES	6	58, 44 ^a, 102 ^b	23, 20 ^b	19	53%, 48% ^a, 51% ^b
Sukantarat et al. 2007 [16]	-	IES-I	3	51	13 (9)	21	(24%) ^c
		IES-I	9	45	12 (10)	21	(20%) ^c
		IES-A	3	51	12 (9)	18	(36%) ^c
		IES-A	9	45	12 (9)	18	(38%) ^c
		IES-Total	3	51	-	26	35%
		IES-Total	9	45	-	26	62%
Griffiths et al. 2006 [17]	-	TSQ	3	108	-	6	52%
Girard et al. 2007 [18]	-	PTSS-10	6	43	-	35	14%
Nickel et al. 2004 [19]	42%	SCID-PTSD	6	41	n/a	n/a	10%
Nickel et al. 2004 [19]	42%	PTSS-10	6	41	-	35	17%
Rattray et al. 2005 [20]	-	IES-I	0.75	109	7 (3)	20	(18%) ^c
			6	61	6 (3)
			12	80	7 (3)
		IES-A	0.75	109	6 (3)	20	(20%) ^c
			6	61	4 (5)
			12	80	6 (4)
Kress et al. 2003 [21]	38%, 11% ^a 22% ^b	IES	14, 12 ^a	13, 19 ^a, 32 ^b	11 (15), 27 (19) ^a	-	-
Kress et al. 2003 [21]	38%, 11% ^a 22% ^b	Interview ^d	14, 12 ^a	13, 19 ^a, 32 ^b	n/a	n/a	0%, 32%^a, 19% ^b
Scragg et al. 2001 [22]	-	IES	13 (6) [3–21]	77	-	30	16%
Schelling et al. 2001 [23]	-	SCID-PTSD			n/a	n/a	11%, 64% ^a, 40% ^b
Schelling et al. 2001 [23]	-	PTSS-10	31	9, 11^a, 20 ^b	27, 36 ^a	35	11%, 64% ^a, 40% ^b,^e
Schelling et al. 1999 [24]	-	PTSS-10	48, 120 ^b	27, 27 ^a, 54 ^b	-	35	18%, 59% ^a, 39% ^b

Abbreviations (in alphabetical order): DTS = Davidson Trauma Scale; IES = Impact of Events Scale; IES-A = Impact of Events Scale-Avoidance Subscale; IES-I = Impact of Events Scale-Intrusion Subscale; IES-R = Impact of Events Scale-Revised; n/a = not-applicable; PDS = Posttraumatic Diagnostic Scale; PTSD = post-traumatic stress disorder; PTSS-10 = Post Traumatic Symptom Scale-10; PTSS-14 = Post Traumatic Symptom Scale-14; SCID = Structured Clinical Interview for DSM-IV; TSQ = Trauma Stress Questionnaire; “-” = not reported.

control group value (for randomized-controlled trials and case-control studies);

entire sample;

clinically significant symptoms of intrusion or avoidance;

PTSD diagnosed using an unspecified structured interview with a clinical psychologist;

not included in questionnaire-based median prevalence estimate.