Table 7 Discriminant validity between known groups of the SF-36

Physical functioning

Mean ± SD

89.5 ± 17.3

81.4 ± 19.8

77.6 ± 23.4

 < 0.001

 < 0.001

1.000

.012

Median (range)

95 (86.2–1000)

90 (65–100)

85 (65–95)

n

72

87

106

Role Physical

Mean ± SD

82.8 ± 25.9

74.6 ± 23.3

62.9 ± 26.8

 < 0.001

 < 0.001

.760

.053

Median (range)

100 (75–100)

75 (56.3–100)

63,5 (43.8–87.5)

n

73

89

108

Bodily pain

Mean ± SD

77.0 ± 25.2

60.7 ± 29.6

46.1 ± 27.9

 < 0.001

 < 0.001

.876

.006

Median (range)

84 (61–100)

62 (41–84)

41 (22–62)

n

73

88

109

General health

Mean ± SD

64.3 ± 20.8

54.4 ± 25.0

44.3 ± 23.2

 < 0.001

 < 0.001

1.000

.077

median (range)

67 (52–80)

56 (30.5–72)

42 (30–62)

n

73

88

107

Vitality

Mean ± SD

63.2 ± 20.1

55.5 ± 18.4

49,8 ± 20,7

 < 0.001

 < 0.001

.379

.059

Median (range)

62.5 (53.1–75)

56.3 (43.8–68.8)

50 (31.3–68.8)

n

73

88

110

Social functioning

Mean ± SD

80.6 ± 23.4

77,1 ± 22,7

65,6 ± 25,9

 < 0.001

 < 0.001

.850

1.000

Median (range)

87.5 (75–100)

87,5 (62,5–100)

62,5 (50–87,5)

n

72

88

109

Role Emotional

Mean ± SD

80.9 ± 24.7

81.9 ± 23.4

71.0 ± 26.1

.005

.020

.606

1.000

Median (range)

91.7 (66.7–100)

91.7 (75–100)

75 (50–100)

n

73

89

108

General health

Mean ± SD

71.8 ± 20.4

67.4 ± 17.7

60.0 ± 21.5

 < 0.001

 < 0.001

.048

.600

Median (range)

75 (65–85)

67.5 (56.3–83,8)

65 (45–75)

n

71

88

108

PCS

Mean ± SD

52.6 ± 7.3

49.2 ± 8.3

47.6–9.8

 < 0.001

 < 0.001

1.000

.011

median (range)

54.9 (51.2–57.0

52.8 (42.3–57.0)

50.7 (42.3–54.9)

n

72

87

106

MCS

Mean ± SD

50.1 ± 10.2

46.9 ± 9.1

42.3 ± 10.5

 < 0.001

 < 0.001

.760

.052

Median (range)

56.9 (47.1–56.9)

47.1 (39.7–56.9)

42.2 (34.8–52.0)

n

73

89

108