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

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

Item (personality disorder criterion number in DSM-IV) Frequency (%) (N = 145) Internal consistencya Sensitivity Specificity PVP b PVN c CCd
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
  1. 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
  2. BRD: Borderline PD; HST: Histrionic PD, PAR: Paranoid PD; AVD: Avoidant PD, NAR: Narcissistic PD.