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Table 1 Baseline patient characteristics and score changes

From: Measurement properties of PROMIS short forms for pain and function in patients receiving knee arthroplasty

Characteristicsa

Baseline (N = 143)

Longitudinal (N = 119)

Test–retest (N = 50)

Age (years)

68.3 (8.9)

68.5 (9.0)

69.3 (8.5)

Gender (men, women) (n, %)

57, 86 (39.9, 60.1)

49, 70 (41.2, 58.8)

14, 36 (28.0, 72.0)

Height (cm)

169.1 (9.7)

169.6 (9.7)

166.0 (8.4)

Weight (kg)

79.9 (16.9)

79.3 (17.0)

76.2 (14.8)

Body mass index (kg/m2)

27.8 (4.7)

27.4 (4.6)

27.6 (4.4)

PROMIS PAIN (T-score)

65.2 (7.7)

64.5 (7.7)b

65.6 (6.6)

PROMIS PI (T-score)

64.8 (5.8)

64.4 (5.9)

66.1 (5.6)

PROMIS PF (T-score)

36.6 (4.9)

36.9 (5.0)b

35.2 (4.5)

OKS

23.8 (8.4)c

24.3 (8.5)c

22.1 (7.3)

PROMIS PAIN (T-score change, 95% CI)

 

 − 19.6 (− 21.5 to − 17.6)

 

PROMIS PI (T-score change, 95% CI)

 

 − 16.1 (− 17.6 to − 14.7)

 

PROMIS PF (T-score change, 95% CI)

 

10.9 (9.8 to 12.0)

 

OKS (score change, 95% CI)

 

16.9 (15.5 to 18.3)

 
  1. PROMIS Patient Reported Outcomes Measurement Information System; PAIN pain intensity; PI pain interference; PF physical function; T-score overall PROMIS score calculated per domain; OKS Oxford Knee Score; CI confidence interval
  2. aExpressed as mean with standard deviation, unless otherwise stated
  3. bFor two cases, all short form items were missing and scores could not be calculated
  4. cFor one case, one item was missing and replaced by the mean of all other items to calculate the score