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Table 1 Demographic, clinical and laboratorial variables of 605 maintenance hemodialysis patients from four outpatient dialysis units in Salvador, Bahia, Brazil, stratified by HTLV-1 serology

From: Prevalence and risk factors for Human T-Lymphotropic Virus Type 1 (HTLV-1) among maintenance hemodialysis patients

Independent variables HTLV (+)
N = 15
HTLV (−)
N = 590
POR
(95% CI)
p
Demographic
 Age, years 52.5 (46.9–71.0) 47.8 (37.7–59.0) 1.03 (1.00–1.07) 0.080
 Female (vs. male) 8/15 (53.3) 224/590 (38.0) 1.87 (0.67–5.22) 0.234
 Non-white (vs. white) 13/15 (86.7) 513/590 (86.9) 1.03 (0.23–4.63) 0.974
 Poor or very poor (vs. classes A thru C) 10/15 (66.7) 265/580 (45.7) 2.38 (0.80–7.04) 0.118
 Less than high school (vs. high school or greater) 12/15 (80.0) 359/589 (61.0) 2.56 (0.72–9.18) 0.148
 Unmarried (vs. married) 11/15 (73.3) 261/588 (44.4) 3.45 (1.09–10.95) 0.036
Clinical
 Dialysis by catheter (vs. AV fistula) 4/15 (26.7) 76/588 (12.9) 1.12 (0.31–4.02) 0.867
 Time on MHD, months 20.4 (4.5–58.4) 47.8 (19.6–97.4) 0.99 (0.97–1.00) 0.064
 EPO, IU (x103)/week 12 (6–12) 10 (6–12) 1.00 (1.00–1.00) 0.870
 Diabetes mellitus (vs. no) 5/15 (33.3) 100/590 (16.9) 2.45 (0.82–7.32) 0.109
 Systemic hypertension (vs. no) 13/15 (86.7) 533/590 (90.3) 0.70 (0.15–3.16) 0.638
 Blood transfusion (vs. no) 4/15 (26.7) 55/582 (9.2) 3.48 (1.07–11.31) 0.038
 Hepatitis B (vs. no) 1/15 (6.7) 11/589 (1.9) 3.75 (0.45–31.10) 0.220
 Hepatitis C (vs. no) 1/15 (6.7) 18/590 (3.1) 2.27 (0.28–18.21) 0.440
 Hepatitis B or C (vs. no) 2/15 (13.3) 28/589 (4.8) 3.08 (0.66–14.33) 0.151
  1. Continuous data (Age, Time on MHD and EPO dose) are expressed as median (P25–P75%); categorical data are expressed as n/total (%); POR Prevalence Odds Ratio, EPO Erythropoietin, MHD maintenance hemodialysis. For continuous data, POR reflects the odds of a positive HTLV serology with each increase in one unit of the continuous variable (one year for Age, one month for Time on MHD, and 103 IU/week for EPO); for categorical data, POR reflects the odds of a positive HTLV serology in the variable of interest compared to its complement. History of blood transfusion was limited to available data that reported transfusion only for the previous three months. P values in bold highlight the variables that were selected for the multivariable logistic regression model. Although a positive serology for Hepatitis B was associated with a p ≤ 0.25, it was not included in the multivariable model because we preferred to use the variable Hepatitis B or C