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Table 8 ROC analyses of NPS questions A, B and C at 3- and 12-months postoperatively

From: Net Promoter Score: a prospective, single-centre observational study assessing if a single question determined treatment success after primary or revision hip arthroplasty

Question A

PROM/ Measurement

AUC (95% CI)

p-value

Threshold value

Model quality

3-months postoperative

Pain intensity

0.811 (0.753–0.870)

< 0.001

3.5

0.75

OHS

0.797 (0.752–0.842)

< 0.001

31.32

0.75

OHS pain

0.773 (0.726–0.821)

< 0.001

61.25

0.73

OHS function

0.780 (0.734–0.826)

< 0.001

65.83

0.73

EQ-5D index

0.823 (0.780–0.865)

< 0.001

0.794

0.78

EQ-5D VAS

0.817 (0.775–0.859)

< 0.001

72.5

0.78

12-months postoperative

Pain intensity

0.806 (0.751–0.861)

< 0.001

3.5

0.75

OHS

0.835 (0.796–0.874)

< 0.001

38.50

0.80

OHS pain

0.830 (0.790–0.870)

< 0.001

77.08

0.79

OHS function

0.810 (0.766–0.854)

< 0.001

84.17

0.77

EQ-5D index

0.860 (0.820–0.900)

< 0.001

0.794

0.82

EQ-5D VAS

0.784 (0.733–0.835)

< 0.001

77.50

0.73

Question B

PROM/ Measurement

AUC (95% CI)

p-value

Threshold value

Model quality

3-months postoperative

Pain intensity

0.849 (0.801–0.896)

< 0.001

2.5

0.80

OHS

0.806 (0.755–0.857)

< 0.001

26.09

0.75

OHS pain

0.788 (0.738–0.838)

< 0.001

56.25

0.74

OHS function

0.786 (0.732–0.841)

< 0.001

54.58

0.73

EQ-5D index

0.820 (0.771–0.869)

< 0.001

0.8065

0.77

EQ-5D VAS

0.775 (0722-0.827)

< 0.001

64.5

0.72

12-months postoperative

Pain intensity

0.859 (0.811–0.906)

< 0.001

3.5

0.81

OHS

0.873 (0.838–0.908)

< 0.001

38.50

0.84

OHS pain

0.863 (0.824–0.903)

< 0.001

77.08

0.82

OHS function

0.857 (0.818–0.895)

< 0.001

81.25

0.82

EQ-5D index

0.872 (0.831–0.912)

< 0.001

0.8065

0.83

EQ-5D VAS

0.808 (0.755–0.860)

< 0.001

73.50

0.75

Question C

PROM/ Measurement

AUC (95% CI)

p-value

Threshold value

Model quality

3-months postoperative

Pain intensity

0.794 (0.722–0.867)

< 0.001

3.5

0.72

OHS

0.801 (0.747–0.855)

< 0.001

26.09

0.75

OHS pain

0.774 (0.717–0.831)

< 0.001

59.17

0.72

OHS function

0.776 (0.718–0.834)

< 0.001

68.75

0.72

EQ-5D index

0.789 (0.729–0.848)

< 0.001

0.7445

0.73

EQ-5D VAS

0.727 (0.662–0.793)

< 0.001

72.50

0.66

12-months postoperative

Pain intensity

0.821 (0.765–0.876)

< 0.001

3.5

0.77

OHS

0.805 (0.750–0.860)

< 0.001

36.50

0.75

OHS pain

0.805 (0.747–0.863)

< 0.001

77.08

0.75

OHS function

0.778 (0.717–0.838)

< 0.001

77.08

0.72

EQ-5D index

0.815 (0.762–0.869)

< 0.001

0.794

0.76

EQ-5D VAS

0.754 (0.687–0.822)

< 0.001

67.50

0.69

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BMC Musculoskeletal Disorders

ISSN: 1471-2474

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