Table 5 Frequency of positive NPSI item responses

73.4

31.9

< 0.001*

30.8

< 0.001*

70.5

50.8

24.3

0.001*

53.1

0.859

63.4

64.4

67.0

0.857

87.5

0.003*

60.6

42.6

21.9

0.010*

42.2

1.000

61.2

68.8

68.9

1.000

61.6

0.468

60.1

31.1

36.4

0.596

15.9

0.040*

68.5

62.5

62.9

1.000

38.0

0.006*

67.5

29.5

17.9

0.114

27.7

0.849

42.5

77.7

26.1

< 0.001*

35.6

< 0.001*

63.0

52.3

26.4

< 0.001*

30.5

0.014*

66.4

NP

OA

p

(NP vs. OA)

H

p

(NP vs. H)

all

4.7 (3.4)

2.0 (3.3)

< 0.001*

1.8 (2.8)

< 0.001*

2.8 (3.4)

3.3 (3.6)

1.4 (2.7)

< 0.001*

3.2 (3.4)

0.804

2.5 (3.3)

3.7 (3.2)

4.0 (3.4)

0.697

5.4 (3.2)

0.004*

4.4 (3.4)

2.6 (3.4)

1.4 (2.9)

0.026*

2.1 (3.1)

0.396

2.0 (3.1)

4.5 (3.6)

4.4 (3.5)

0.924

4.1 (3.8)

0.543

4.3 (3.6)

1.7 (3.7)

2.1 (3.6)

0.401

0.9 (3.3)

0.110

1.6 (3.6)

4.0 (3.7)

4.1 (3.6)

0.957

2.2 (3.3)

0.003*

3.5 (3.6)

1.7 (2.9)

1.0 (2.4)

0.111

1.4 (2.6)

0.460

1.3 (2.6)

4.4 (3.2)

1.2 (2.3)

< 0.001*

1.5 (2.4)

< 0.001*

2.2 (2.9)

3.3 (3.5)

1.3 (2.4)

< 0.001*

1.3 (2.4)

< 0.001*

1.9 (2.9)

33.2

22.5

22.5

(19.5)

(14.1)

< 0.001*

(14.1)

< 0.001*