Psychometric properties of the psychosocial screening instrument for physical trauma patients (PSIT)

Table 5 Cronbach’s alpha coefficients and floor and ceiling effects of the total PSIT and the subscales

	Possible min - max	Observed min - max	Median	IQR	Cronbach’s alpha	Floor (%)	Ceiling (%)
Total PSIT	0–45	0–42	5	2–13	0.92	9.9	0.0
Subscale 1: Negative affect	0–21	0–21	2	0–7	0.91	26.9	0.3
Subscale 2: Anxiety and PTSS	0–12	0–12	2	1–4	0.77	20.3	0.8
Subscale 3: Social and self-image	0–12	0–12	1	0–2	0.79	47.0	0.3

Abbreviations: IQR Interquartile Range, PSIT Psychosocial Screening Instrument for Trauma patients, PTSS Post-Traumatic Stress Symptoms

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