Table 1 Mean (SD) comparisons between violent and non-violent groups after controlling for age and gender as co-variants. Effect sizes and AUC for receiver operator characteristics (ROC)

F-statistic (df 1,87)

P value

Partial Eta squared

mean

S.D.

mean

S.D.

d

lower

upper

AUC

lower

upper

Age

40.9

12.7

36.1

9.4

1.342

0.250

-

0.38

−0.27

1.04

0.62

0.45

0.80

Length of stay (years)

8.0

9.7

3.0

5.0

2.243

0.13

-

0.50

−0.16

1.16

0.73

0.54

0.91

Chlorpromazine equivalents

538

366

772

397

3.6

0.063

-

0.64

−0.03

1.30

0.67

0.46

0.88

Pre-morbid IQ (TOPF-UK)

96.0

12.6

96.8

8.1

0.023

0.879

-

0.06

−0.72

0.84

.49

0.31

0.67

PANSS total

62.5

20.0

90.1

19.4

12.2

0.001

.157

1.38

0.58

2.19

0.84

0.71

0.97

PANSS positive

13.7

7.0

21.6

8.7

9.32

0.003

.113

1.21

0.41

2.01

0.79

0.65

0.93

PANSS negative

18.9

7.9

25.0

6.5

6.175

0.111

.078

0.98

0.19

1.78

0.71

0.55

0.87

PANSS general

29.02

10.3

43.6

10.4

14.202

.000

.163

1.49

0.68

2.31

0.86

0.73

0.99

HCR-20 total score

20.8

5.7

28.2

8.0

14.04

0.000

.142

1.26

0.57

1.94

0.78

0.59

0.96

HCR-20 Historical

12.9

2.7

15.2

4.5

5.178

.025

.057

0.763

0.09

1.43

0.75

0.55

0.95

HCR-20 Current

4.50

2.63

7.2

2.78

12.59

.001

.129

1.91

0.51

1.87

0.76

0.59

0.94

HCR-20 Risk

3.39

2.12

5.80

2.29

10.06

.002

.106

1.064

0.39

1.74

0.77

0.62

0.71

SOFAS

59.2

17.2

35.6

18.9

14.9

0.001

-

1.29

0.61

1.98

0.83

0.66

0.99

DUNDRUM-1 (11 item)

29.54

5.01

27.40

7.1

.994

0.322

.012

0.334

−0.33

0.99

0.44

0.21

0.66

DUNDRUM-1 (9 item)

27.08

3.93

23.90

6.93

3.275

0.074

.037

0.607

−0.06

1.27

0.38

0.16

0.60