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Table 1 Sociodemographics at index date

From: Impact of oral osteoarthritis therapy usage among other risk factors on knee replacement: a nested case-control study using the Osteoarthritis Initiative cohort

  Knee replacement
Case (n = 218) Control (n = 540)
Time to KR after cohort entry, % (n)
 Between year 1 and year 2 10.6% (23)
 Between year 2 and year 3 15.1% (33)
 Between year 3 and year 4 18.8% (41)
 Between year 4 and year 5 17.9% (39)
 Between year 5 and year 6 12.8% (28)
 Between year 6 and year 7 7.8% (17)
 Between year 7 and year 8 8.3% (18)
 Between year 8 and year 9 8.7% (19)
 Median (IQR) (years) 4.3 (1.0–8.9)  
OAI subcohort, % (n)
 Progression 61.9% (135) 58.5% (316)
 Incidence 38.1% (83) 41.5% (224)
Age (years), median (IQR) 68.9 (61.8–74.3) 68.6 (61.6–73.8)
Female, % (n) 60.6% (132) 61.1% (330)
Race, % (n) (n = 217)  
 White or Caucasian 83.9% (182) 78.0% (421)
 Black or African American 12.5% (27) 19.4% (105)
 Asian 1.8% (4) 0.4% (2)
 Other non-white 1.8% (4) 2.2% (12)
Income level USD, % (n)
 Less than $25,000 10.6% (23) 12.4% (67)
 $25,000 to < $50,000 28.0% (61) 30.6% (165)
 $50,000 to < $100,000 38.0% (83) 38.9% (210)
 $100,000 or greater 23.4% (51) 18.1% (98)
Education level, % (n)
 Less than high school graduate 0.9% (2) 4.1% (22)
 High school graduate 19.3% (42) 10.9% (59)
 Some college 26.6% (58) 30.7% (166)
 College graduate 18.3% (40) 18.2% (98)
 Some graduate school 6.9% (15) 7.2% (39)
 Graduate degree 28.0% (61) 28.9% (156)
  1. Data shown are proportion of patients (%), number of patients (n), age in years, or median (interquartile range (IQR))
  2. KR knee replacement, OAI Osteoarthritis Initiative