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Table 3 Predictors of subject visit participation in HOST study by bivariate and multivariate GEE analysis.

From: Determinants of subject visit participation in a prospective cohort study of HTLV infection

Predictor Crude OR
(95% CI)
P a Adjusted OR
(95% CI)
P b
Site     
   Chesapeake 0.72 (0.48, 1.09) 0.12 0.69 (0.45, 1.04) 0.08
   Detroit 0.45 (0.30, 0.67) <0.001 0.47 (0.31, 0.71) <0.001
   Los Angeles 0.73 (0.52, 1.03) 0.08 0.67 (0.48, 0.94) 0.02
   Oklahoma City 0.88 (0.56, 1.40) 0.59 0.75 (0.47, 1.19) 0.22
   San Francisco Reference   Reference  
Phase     
   Visit 3 vs. Visit 2 0.63 (0.54, 0.73) <0.001 1.34 (1.00, 1.79) 0.05
   Visit 5 vs. Visit 3 0.29 (0.24, 0.35) <0.001 0.29 (0.22, 0.39) <0.001
   Visit 6 vs. Visit 5 0.28 (0.23,0.33) <0.001 1.38 (0.90, 2.11) 0.14
Reimbursement for interview     
   $25 vs. $10 1.14 (0.95, 1.47) 0.13 1.84 (1.22, 2.77) 0.004
Gender     
   Female 1.25 (0.99, 1.57) 0.05 1.31 (1.04, 1.66) 0.02
   Male Reference   Reference  
Age     
   One year increase 1.00 (0.99, 1.02) 0.69 1.00 (0.99, 1.01) 0.41
Race/Ethnicity     
   Black 0.51 (0.40, 0.67) <0.001 0.61 (0.47, 0.80) 0.004
   Asian 0.74 (0.44, 1.24) 0.25 0.68 (0.42, 1.10) 0.11
   Hispanic 0.71 (0.52, 0.96) 0.03 0.76 (0.56, 1.04) 0.09
   Other 0.59 (0.35,0.99) 0.05 0.59 (0.36, 0.99) 0.05
   White Reference   Reference  
Education     
   High school or less Reference   Reference  
   Some college 1.35 (1.05, 1.73) 0.02 1.14 (0.89, 1.47) 0.29
   Bachelor's degree 2.01 (1.43, 2.28) <0.001 1.56 (1.09, 2.23) 0.02
   Master's or professional degree 2.31 (1.45, 3.67) <0.001 1.86 (1.19, 2.92) 0.01
Annual income     
   <$10,000 Reference   Reference  
   $10,000–29,999 1.56 (1.04, 2.34) 0.03 1.47 (0.97, 2.28) 0.07
   $30,000–49,999 1.74 (1.17, 2.59) 0.01 1.57 (1.04, 2.40) 0.03
   $50,000–74,999 2.52 (1.64, 3.88) <0.001 1.96 (1.24, 3.10) 0.004
   ≥ $75,000 3.73 (2.25, 6.19) <0.001 2.68 (1.58, 4.56) 0.003
Health status in previous Visit     
   Excellent 1.72 (1.18,2.50) 0.01 1.20 (0.80, 1.81) 0.38
   Very good 1.75 (1.22,2.52) 0.003 1.33 (0.91, 1.96) 0.14
   Good 1.18 (081,1.72) 0.38 1.12 (0.85, 1.47) 0.14
   Fair or Poor Reference   Reference  
Ever used IV drugs     
   Yes 1.57(1.08,2.26) 0.02 1.08 (0.83,1.42) 0.55
   No Reference   Reference  
HTLV status     
   HTLV-I 0.64 (0.46, 0.89) 0.01 1.12 (0.85,1.47) 0.42
   HTLV-II 0.70 (0.55, 0.88) 0.003 1.01 (0.70, 1.45) 0.96
   HTLV-Negative Reference   Reference  
Referral for further exam in previous visit     
   Yes 0.86 (0.68, 1.09) 0.22 1.08 (0.83,1.42) 0.55
   No Reference   Reference  
  1. Note: OR = odds ratio; CI= confidence interval.
  2. abivariate analysis
  3. bmultivariate analysis, controlling for all other values shown in the table