Table 3.

Factors independently associated with electronic health record portal use

VariableOR (95% CI)
ABC
Agea (80 yr versus 40 yr)0.35 (0.28 to 0.44)0.29 (0.22 to 0.38)0.29 (0.21 to 0.38)
Sex (female versus male)1.14 (0.97 to 1.35)1.13 (0.94 to 1.34)1.13 (0.95 to 1.35)
Black versus nonblack0.52 (0.42 to 0.66)0.50 (0.39 to 0.64)0.50 (0.39 to 0.64)
Marital status (married versus unmarried)1.50 (1.26 to 1.80)1.57 (1.30 to 1.89)1.57 (1.31 to 1.90)
Insurance status
Medicaid versus private0.56 (0.39 to 0.81)0.53 (0.36 to 0.77)0.53 (0.36 to 0.77)
Medicare versus private0.79 (0.65 to 0.96)0.80 (0.65 to 0.98)0.80 (0.65 to 0.98)
Self-pay versus private0.76 (0.54 to 1.09)0.81 (0.56 to 1.16)0.81 (0.56 to 1.16)
Median household income (per $40,000 versus $20,000)b1.57 (1.30 to 1.90)1.53 (1.26 to 1.86)1.53 (1.26 to 1.86)
  • Model A: adjusted for age, sex, race, marital status, insurance status, neighborhood median household income, tobacco use, and length of follow-up; model B: variables for model A as well as hypertension, hyperlipidemia, nephrolithiasis, history of kidney transplant, proteinuria, eGFR, number of nephrology visits, number of non-nephrology outpatient visits, and university-affiliated primary care provider; model C: variables for models A and B as well as Charlson comorbidity index. OR, odds ratio; 95% CI, 95% confidence interval.

  • a The reported odds ratio is comparison specific because of nonlinear effects.

  • b The reported odds ratio is comparison specific because of natural logarithmic transformation.