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Table 3 Demographics and comorbidities for patients undergoing primary total knee arthroplasty

From: Does dehydration prior to primary total joint arthroplasty increase risk of perioperative complications?

Demographics and Comorbidities Hydration Status P-valuea
Non-Dehydrated Dehydrated
N = 176,372 N = 156,113
Age (years) mean ± SD 65.9 ± 9.5 68.2 ± 9.0  < 0.001
Sex     < 0.001
 Female 14,309 8.1% 16,015 10.3%  
BMI (kg/m2)     < 0.001
  < 18 181 0.1% 221 0.1%  
 18–25 14,309 8.1% 16.015 10.3%  
 25–30 47,112 26.7% 41,306 26.5%  
 30–35 52,210 29.8% 44,598 28.6%  
 35–40 25,971 20.4% 30,836 19.8%  
  > 40 26,289 14.9% 23,137 14.8%  
Functional status prior to surgery    0.528
 Independent 174,574 99.9% 154,487 99.0%  
 Dependent 1798 1.0% 1626 1.0%  
ASA     < 0.001
 1 3030 1.7% 2547 1.6%  
 2 82,401 46.7% 76,620 49.1%  
 3 87,695 49.7% 74,604 47.8%  
  ≥ 4 3246 1.8% 2342 1.5%  
Diabetes mellitus    0.032
 No diabetes mellitus 143,737 81.5% 127,171 81.5%  
 Non-insulin-dependent diabetes mellitus 24,634 14.0% 22,107 14.0%  
 Insulin-dependent diabetes mellitus 8001 4.5% 6835 4.4%  
Smoker     < 0.001
 No 158,498 89.9% 147,051 94.2%  
 Yes 17,874 10.1% 9062 5.8%  
Congestive heart failure    0.707
 No 175,794 99.7% 155,613 99.7%  
 Yes 578 0.3% 500 0.3%  
  1. Bold fonts indicate statistical significance.
  2. aStatistical significance set at P < 0.05