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Table 4 Change in clinical symptoms and serum inflammatory markers over 60 months in participants who maintained sufficient vitamin D levels and participants who did not maintain sufficient vitamin D levels

From: Long-term effects of vitamin D supplementation and maintaining sufficient vitamin D on knee osteoarthritis over 5 years

 

Vitamin D non-maintainer

Vitamin D maintainer

Between-group change

n

change

n

change

WOMAC pain

60

 − 15.3 (− 37.6, 7.1)

79

 − 38.4 (− 57.9, − 18.9)

 − 23.1 (− 52.9, 6.6)

 No surgery

49

 − 10.5 (− 34.7, 13.6)

68

 − 44.4 (− 65, − 23.8)

 − 33.9 (− 65.7, − 2)

WOMAC function

60

 − 42.2 (− 107.8, 23.4)

79

 − 113 (− 170.3, − 55.7)

 − 70.8 (− 158.1, 16.5)

 No surgery

49

 − 22.4 (− 92.7, 48)

68

 − 127.9 (− 187.8, − 68)

 − 105.5 (− 198.2, − 12.8)

WOMAC stiffness

60

 − 12.2 (− 22, − 2.5)

79

 − 15.4 (− 23.9, − 6.9)

 − 3.1 (− 16.1, 9.8)

 No surgery

49

 − 9.3 (− 19.7, 1.2)

68

 − 16 (− 24.8, − 7.2)

 − 6.7 (− 20.4, 7)

Study knee VAS pain

61

 − 13.1 (− 19.4, − 6.8)

79

 − 17.4 (− 22.9, − 11.8)

 − 4.2 (− 12.7, 4.2)

 No surgery

50

 − 12 (− 19, − 5.1)

68

 − 18.3 (− 24.3, − 12.3)

 − 6.3 (− 15.5, 2.9)

Utility

60

 − 0.023 (− 0.057, 0.01)

78

 − 0.013 (− 0.042, 0.016)

0.01 (− 0.034, 0.054)

 No surgery

49

 − 0.031 (− 0.068, 0.005)

67

 − 0.01 (− 0.041, 0.021)

0.021 (− 0.027, 0.07)

PHQ9

61

0.2 (− 0.6, 0.9)

79

 − 0.6 (− 1.3, 0.1)

 − 0.8 (− 1.8, 0.3)

 No surgery

50

0.5 (− 0.3, 1.4)

68

 − 0.5 (− 1.2, 0.3)

 − 1 (− 2.1, 0.1)

IL6

57

 − 5 (− 9.9, − 0.1)

73

 − 5.1 (− 9.4, − 0.8)

 − 0.1 (− 6.6, 6.5)

 No surgery

47

 − 5.5 (− 11.4, 0.5)

62

 − 5.5 (− 10.6, − 0.4)

 − 0.1 (− 7.9, 7.8)

hs-CRP

57

 − 0.4 (− 0.9, 0.2)

73

0.1 (− 0.4, 0.5)

0.4 (− 0.3, 1.1)

 No surgery

47

 − 0.3 (− 0.8, 0.3)

62

 − 0.1 (− 0.6, 0.4)

0.2 (− 0.6, 0.9)

  1. BMI body mass index, hs-CRP high sensitivity C Reactive protein, WOMAC Western Ontario and McMaster Universities Osteoarthritis Index, AQoL Assessment of Quality of Life, PHQ9 Patient Health Questionnaire-9. The between-group difference in change in outcomes was analysed using repeated measures mixed-effects model with fixed terms for age, sex, BMI, KS, physical activity, and treatment status or vitamin D maintainer status. Bold figures denote statistical significance (P < 0.05)
  2. Surgery, including TKR occurred during the 24- and 60-month observational period, and their symptoms, utility, and depression scores were obtained at the 60-month follow-up only, which was after the surgery