Adjusted Relative Risk of Using MyChart Once, 2 to 23 Times, and ≥24 Times, by Patient Sociodemographic Characteristics
| Sociodemographic Characteristics | Risk Ratio (95% Confidence Interval) | ||
|---|---|---|---|
| Logged in Once (n = 1,724) | Logged in 2–23 Times (n = 6,557) | Logged in ≥24 Times (n = 2,604) | |
| Sex | |||
| Female* | 1.00 | 1.00 | 1.00 |
| Male† | 0.81 (0.69–0.96) | 0.81 (0.72–0.91) | 0.80 (0.72–0.90) |
| Age group (years) | |||
| 18–29 | 1.00 | 1.00 | 1.00 |
| 30–39 | 1.23 (1.00–1.53) | 1.29 (1.16–1.43) | 1.21 (1.01–1.46) |
| 40–49 | 1.21 (0.96–1.54) | 1.20 (1.05–1.39) | 1.01 (0.77–1.31) |
| 50–64 | 1.04 (0.79–1.36) | 1.22 (1.04–1.44) | 1.09 (0.87–1.38) |
| 65–74 | 1.10 (0.72–1.68) | 1.65 (1.21–2.24) | 1.17 (0.87–1.57) |
| ≥75 | 0.64 (0.35–1.17) | 0.85 (0.56–1.27) | 0.52 (0.34–0.81) |
| Race | |||
| White | 1.00 | 1.00 | 1.00 |
| Nonwhite | 0.61 (0.38–0.99) | 0.45 (0.27–0.75) | 0.25 (0.15–0.43) |
| Unknown | 0.93 (0.56–1.56) | 1.02 (0.70–1.48) | 0.86 (0.57–1.29) |
| Ethnicity | |||
| Non-Hispanic | 1.00 | 1.00 | 1.00 |
| Hispanic | 0.68 (0.50–0.94) | 0.61 (0.44–0.84) | 0.51 (0.35–0.74) |
| Unknown | 0.89 (0.60–1.30) | 0.66 (0.53–0.83) | 0.71 (0.42–1.21) |
| Health insurance | |||
| Private | 1.00 | 1.00 | 1.00 |
| Public | 0.64 (0.53–0.77) | 0.56 (0.45–0.70) | 0.76 (0.60–0.98) |
| Uninsured | 0.81 (0.66–1.00) | 0.80 (0.67–0.96) | 1.01 (0.78–1.31) |
| Unknown | 1.33 (0.66–2.69) | 1.04 (0.40–2.67) | 4.12 (0.36–47.1) |
| Number of primary care visits during study period | |||
| 0 | 1.00 | 1.00 | 1.00 |
| 1 | 1.09 (0.69–1.72) | 1.2 (0.79–1.84) | 2.60 (1.18–5.76) |
| 2 | 1.54 (0.98–2.42) | 2.19 (1.42–3.38) | 8.78 (4.04–19.1) |
| 3 or 4 | 1.60 (1.02–2.49) | 2.60 (1.64–4.13) | 19.3 (9.06–41.1) |
| 5–8 | 1.68 (1.07–2.63) | 2.64 (1.64–4.25) | 39.1 (18.3–83.5) |
| >8 | 1.94 (1.17–3.20) | 2.31 (1.34–3.99) | 59.4 (26.9–131.3) |
| Household income | |||
| <100% FPL | 1.00 | 1.00 | 1.00 |
| 100–199% FPL | 1.05 (0.90–1.22) | 1.22 (1.10–1.36) | 1.50 (1.34–1.68) |
| 200–399% FPL | 1.90 (1.48–2.44) | 1.89 (1.59–2.23) | 2.62 (2.05–3.35) |
| ≥400% FPL | 1.39 (1.08–1.79) | 1.68 (1.39–2.02) | 1.64 (1.29–2.08) |
| Unknown | 1.13 (0.91–1.41) | 0.94 (0.70–1.27) | 0.94 (0.62–1.45) |
| Language | |||
| English | 1.00 | 1.00 | 1.00 |
| Other | 0.79 (0.48–1.31) | 0.60 (0.36–0.99) | 0.82 (0.45–1.48) |
| Spanish | 0.23 (0.12–0.43) | 0.17 (0.090–0.31) | 0.10 (0.038–0.28) |
| Number of chronic conditions | |||
| 0 | 1.00 | 1.00 | 1.00 |
| 1 | 0.99 (0.90–1.10) | 1.02 (0.90–1.16) | 1.26 (1.07–1.48) |
| ≥2 | 0.82 (0.64–1.05) | 0.86 (0.71–1.05) | 1.16 (0.86–1.57) |
These are risk ratios, not odds ratios. We fit a maximum-likelihood multinomial logit model to estimate probability of (1) having no MyChart use, (2) logging in once on MyChart, or (3) logging in more than once on MyChart. The risk ratio is then the ratio of 2 probabilities conditional on the covariate of interest. This multinomial model included all covariates included in the table, and the risk ratios are all in reference to “no MyChart use.” Models accounted for clustering of patients within service areas by including robust clustered sandwich estimators of variance to estimate rate ratio confidence intervals. The bold values are statistically significant at P < .05.
↵* Includes male-to-female transgender patients.
↵† Includes female-to-male transgender patients.
FPL, federal poverty level.