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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.