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Table 1 Study cohort characteristics by primary diagnosis at total hip arthroplasty surgery

From: An underlying diagnosis of osteonecrosis of bone is associated with worse outcomes than osteoarthritis after total hip arthroplasty

  Total Osteoarthritis Osteonecrosis
  n % n % n %
Total N   47,523 100.0 45,252 95.2 2,271 4.8
Age, years Median (IQR) 66.0 (58.0–74.0) 67.0 (59.0–75.0) 55.0 (46.0–64.0)
Age category, years <65 20,899 44.0 19,195 42.4 1,704 75.0
≥65 26,624 56.0 26,057 57.6 567 25.0
Gender Male 20,181 42.5 18,875 41.7 1,306 57.5
Female 27,341 57.5 26,376 58.3 965 42.5
Race White 36,367 76.5 35,009 77.4 1,358 59.8
Black 3,637 7.7 3,324 7.4 313 13.8
Hispanic 3,283 6.9 3,030 6.7 253 11.1
Asian 1,606 3.4 1,436 3.2 170 7.5
Other/Multi-racial 753 1.6 707 1.6 46 2.0
Unknown 1,877 4.0 1,746 3.9 131 5.8
BMI categorya, kg/m2 <30 27,863 58.6 26,358 58.3 1,505 66.3
  ≥30 and <35 11,625 24.5 11,170 24.7 455 20.0
  ≥35 7,394 15.6 7,138 15.8 256 11.3
ASA categorya 1 and 2 29,312 61.7 28,008 61.9 1,304 57.4
  ≥3 16,724 35.2 15,827 35.0 897 39.5
Diabetes   10,493 22.1 10,042 22.2 451 19.9
  1. IQR interquartile range, BMI body mass index, ASA American Society of Anesthesiologists
  2. aMissing data: BMI (1.4%), ASA (3.1%)