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Table 1 Hemodialysis patient characteristics overall and after case-control matching by COVID-19 status during study period

From: Transmission of SARS-CoV-2 considering shared chairs in outpatient dialysis: a real-world case-control study

  Full Patient Population Matched Case and Control Patients
  All Patients COVID Negative COVID Positive p-valuea,b COVID Negative Controls COVID Positive Cases
Total Patients 170,234 165,452 4,782   2,379 2,379
Mean Age at study start (yr, sd)a 63.5 (14.2) 63.5 (14.2) 64.3 (13.8) 0.0002 63.7 (12.9) 64.2 (13.8)
Mean Time on Dialysis at study start (yr, sd)a 4.2 (4.1) 4.2 (4.1) 4.3 (4.0) 0.0569 4.2 (4.1) 4.4 (4.1)
Sexb
  Male (%) 97,688 (57) 94,991 (57) 2,697 (56) 0.1633 1,334 (56) 1,345 (57)
  Female (%) 72,546 (43) 70,461 (43) 2,085 (44) 0.1633 1,045 (44) 1,034 (43)
Raceb
  White (%) 72,578 (43) 70,736 (43) 1,842 (39) < 0.0001 888 (37) 888 (37)
  Black (%) 46,060 (27) 44,455 (27) 1,605 (34) < 0.0001 848 (36) 833 (35)
  Other (%) 6,720 (4) 6,579 (4) 141 (3) 0.0003 75 (3) 70 (3)
  Unknown (%) 44,876 (26) 43,682 (26) 1,194 (25) 0.0266 568 (24) 588 (25)
  BMI (kg/m2, sd)a 29.9 (7.7) 29.9 (7.7) 29.9 (7.9) 0.7699 29.1 (7.1) 29.8 (7.9)
  CVC used during study (%)b 30,077 (18) 29,112 (17) 965 (20) < 0.0001 395 (17) 450 (19)
  Diabetes (%)b 70,745 (42) 68,525 (41) 2,220 (46) < 0.0001 964 (41) 1,119 (47)
  COPD Diagnosis (%)b 16,331 (10) 15,874 (10) 457 (10) 0.9305 202 (8) 211 (9)
  Mean Number of Treatments Per Patient during study period (sd)a 48 (13) 48 (13) 42 (12) < 0.0001 49 (8) 43 (11)
  Five Year Median HH Income (sd)a $58,702 (16,596) $58,530 (16,519) $64,627 (18,102) < 0.0001 $65,563 (18,159) $65,534 (18,416)
  Five Year Gini Coefficient (sd)a 0.47 (0.03) 0.47 (0.03) 0.48 (0.04) < 0.0001 0.48 (0.04) 0.48 (0.04)
  1. a For continuous variables, p-values result from two-sided t-test H0: mean values for COVID negative patients are equal to mean values for COVID positive patients in the full population
  2. b For categorical variables, p-values result from Chi-Square test H0: proportion in COVID negative patients is equal to proportion in COVID positive patients
  3. BMI Body mass index; CVC central venous catheter; COPD chronic obstructive pulmonary disease; HH household; yr year; sd standard deviation