A cross-sectional testing of The Iowa Personality Disorder Screen in a psychiatric outpatient setting

BMC Psychiatry

Table 1 Item endorsement, internal consistency, sensitivity and specificity of the 11 items of the IPDS

Item (personality disorder criterion number in DSM-IV)	Frequency (%) (N = 145)	Internal consistency^a	Sensitivity	Specificity	PVP ^b	PVN ^c	CC^d
1. Marked shift in mood (BRD-6)	39	0.69	0.77	0.56	0.64	0.70	0.66
2. Uncomfortable without attention (HST-2)	3	0.72	0.06	0.99	0.80	0.99	0.52
3. Actions to obtain immediate satisfaction (HST)*	23	0.72	0.29	0.82	0.03	0.53	0.55
4. Reluctant to confine in others (PAR-3)	42	0.69	0.60	0.75	0.70	0.64	0.67
5. Excessive social anxiety (AVD-1/5)	53	0.68	0.81	0.75	0.77	0.79	0.78
6. Unwilling to get involved unless liked (AVD-2)	49	0.69	0.73	0.75	0.75	0.73	0.74
7. Lack of stable self-image (BRD-3)	23	0.69	0.38	0.92	0.82	0.59	0.65
8. Prone to overemphasis importance (NAR-2/3)	25	0.71	0.33	0.83	0.67	0.55	0.58
9. Expects to be exploited or harmed (PAR-1)	34	0.68	0.52	0.85	0.78	0.64	0.68
10. Bear grudges or is unforgiving (PAR-5)	55	0.72	0.67	0.56	0.61	0.63	0.62
11. Insensitive to others concerns and needs (NAR-2/3)	22	0.71	0.33	0.89	0.75	0.57	0.61

^a α coefficient if item deleted, overall α coefficient is 0.72. ^b PVP: Predictive value of a positive test. ^c PVN: Predictive value of a negative test ^d Correctly classified. * Histrionic PD criterion 7 in DSM-III-R was not retained in DSM-IV
BRD: Borderline PD; HST: Histrionic PD, PAR: Paranoid PD; AVD: Avoidant PD, NAR: Narcissistic PD.

ISSN: 1471-244X