Translation and validation of the Chinese ICD-11 International Trauma Questionnaire (ITQ) for the Assessment of Posttraumatic Stress Disorder (PTSD) and Complex PTSD (CPTSD)

Figures & data

Figure 1. Loading patterns of models in confirmatory factor analysis.

Table 1. Test–retest reliability and semantic equivalence of ITQ by item and symptom cluster (n = 31).

	Test-Retest Reliability			Semantic Equivalence
Item	PA (%)	K	rs	PA (%)	K	rs
PTSD
Re1	52	0.36	0.40	59	0.52	0.51
Re2	65	0.46		59	0.58
Av1	42	0.29	0.55	63	0.71	0.77
Av2	48	0.41		63	0.75
Th1	61	0.24*	0.60	72	0.72	0.62
Th2	55	0.71		66	0.42
Func1	55	0.30	–	63	0.43	–
Func2	65	0.60		72	0.68
Func3	68	0.49		72	0.59
CPTSD
AD1	35	0.47	0.62	75	0.79	0.86
AD2	45	0.71		84	0.69
NSC1	48	0.67	0.70	81	0.87	0.94
NSC2	52	0.62		66	0.87
DR1	58	0.53	0.75	66	0.76	0.85
DR2	61	0.81		81	0.86
Func4	58	0.69	–	59	0.75	–
Func5	74	0.67		84	0.86
Func6	74	0.57		72	0.74

PA = percentage agreement; K = weighted Kappa coefficient; r_s = Spearman’s rho for symptom cluster score; All K and r_s were significant at p < 0.05 unless noted with *.

Table 2. Model fit statistics for alternative models of ICD-11 PTSD based on the ITQ (n = 314).

Model	χ^2	df	p	CFI	TLI	RMSEA (90% CI)	SRMR	BIC
Model 1	569.413	54	.000	.690	.621	0.174 (.162 – .187)	.090	10,309.943
Model 2	63.234	39	.000	.985	.975	0.044 (.023 −.064)	.029	9647.463
Model 3	149.362	48	.000	.939	.916	0.082 (.067 – .097)	.060	9713.464
Model 4	102.125	47	.000	.967	.953	0.061 (.045 – .077)	.042	9652.513

χ2 = Chi-square Goodness of Fit statistic; df = degrees of freedom; p = probability value; CFI = Comparative Fit Index; TLI = Tucker-Lewis Index; RMSEA (90% CI) = Root-Mean-Square Error of Approximation with 90% confidence intervals; SRMR = Standardised Square Root Mean Residual; BIC = Bayesian Information Criterion.

Table 3. Standardised Factor Loadings for Model 2 of PTSD and CPTSD Symptoms.

Item	Re	Av	Th	AD	NSC	DR
Re1	.902
Re2	.744
Av1		.909
Av2		.853
Th1			.871
Th2			.875
AD1				.690
AD2				.718
NSC1					.915
NSC2					.939
DR1						.849
DR2						.914

All loading statistically significant (p < .05). Re1 to Th2 are the PTSD items and AD1 to DR2 are the DSO items.

Table 4. Factor Correlations for Model 2 of ITQ Symptom Clusters.

	Re	Av	Th	AD	NSC
Av	.703
Th	.716	.716
AD	.641	.727	.859
NSC	.386	.534	.531	.743
DR	.454	.597	.530	.868	.734

All correlations significant (p < .001).

Table 5. Correlations between the ITQ symptom clusters with Anxiety and Depression.

ITQ Symptom Clusters	HADS-Anxiety	HADS-Depression
Re	.306	.398
Av	.348	.404
Th	.297	.552
AD	.360	.494
NSC	.519	.556
DR	.433	.468
PTSD	.371	.526
DSO	.508	.583

All correlations significant (p < .001).