Table 4.
Adjusted Incidence Rates for MyChart Activities by Patient Sociodemographic Characteristics
| Incidence Rate Ratios (95% CIs)
|
|||
|---|---|---|---|
| Sociodemographic Characteristics | Requesting | Viewing | Communicating |
| Sex | |||
| Female | 1.00 | 1.00 | 1.00 |
| Male | 0.99 (0.93–1.05) | 0.93 (0.88–0.98) | 0.97 (0.88–1.08) |
| Age group (years) | |||
| 18–29 | 1.00 | 1.00 | 1.00 |
| 30–39 | 0.98 (0.87–1.11) | 0.99 (0.89–1.10) | 1.12 (0.97–1.28) |
| 40–49 | 1.00 (0.91–1.10) | 0.98 (0.91–1.07) | 1.22 (1.11–1.35) |
| 50–64 | 1.03 (0.93–1.15) | 0.94 (0.89–0.99) | 1.31 (1.15–1.48) |
| 65–74 | 0.78 (0.67–0.91) | 0.82 (0.74–0.90) | 1.25 (1.04–1.49) |
| ≥75 | 0.70 (0.57–0.86) | 0.79 (0.67–0.94) | 0.98 (0.77–1.25) |
| Race | |||
| White | 1.00 | 1.00 | 1.00 |
| Nonwhite | 0.94 (0.79–1.11) | 0.94 (0.81–1.10) | 0.69 (0.60–0.79) |
| Unknown | 0.96 (0.82–1.11) | 1.05 (0.87–1.25) | 0.8 (0.59–1.09) |
| Ethnicity | |||
| Non-Hispanic | 1.00 | 1.00 | 1.00 |
| Hispanic | 1.00 (0.88–1.13) | 0.97 (0.89–1.05) | 0.78 (0.67–0.91) |
| Unknown | 0.68 (0.56–0.84) | 0.85 (0.69–1.05) | 1.23 (0.88–1.71) |
| Health insurance | |||
| Private | 1.00 | 1.00 | 1.00 |
| Public | 1.33 (1.20–1.47) | 1.16 (1.08–1.25) | 1.23 (1.11–1.35) |
| Uninsured | 1.23 (1.08–1.40) | 1.13 (1.05–1.23) | 1.13 (0.99–1.28) |
| Unknown | 2.2 (0.81–5.97) | 1.77 (0.84–3.72) | 0.69 (0.25–1.87) |
| Number of primary care visits during study period | |||
| 0 | 1.00 | 1.00 | 1.00 |
| 1 | 1.35 (0.87–2.08) | 0.99 (0.78–1.25) | 0.86 (0.37–2.01) |
| 2 | 1.69 (1.05–2.71) | 1.24 (0.99–1.54) | 1.11 (0.48–2.57) |
| 3 or 4 | 2.37 (1.62–3.46) | 1.53 (1.26–1.87) | 1.33 (0.61–2.90) |
| 5–8 | 3.33 (2.23–4.97) | 2.05 (1.66–2.52) | 1.87 (0.87–4.03) |
| >8 | 4.91 (3.26–7.40) | 2.59 (2.12–3.17) | 2.69 (1.22–5.92) |
| Household income | |||
| <100% FPL | 1.00 | 1.00 | 1.00 |
| 100–199% FPL | 1.07 (0.98–1.17) | 0.99 (0.94–1.05) | 1.07 (0.96–1.19) |
| 200–399% FPL | 1.18 (0.97–1.44) | 1.02 (0.90–1.16) | 1.24 (1.00–1.53) |
| ≥400% FPL | 1.00 (0.89–1.14) | 1.04 (0.94–1.15) | 1.00 (0.91–1.10) |
| Unknown | 0.96 (0.78–1.17) | 0.95 (0.82–1.10) | 0.98 (0.79–1.22) |
| Preferred language | |||
| English | 1.00 | 1.00 | 1.00 |
| Spanish | 1.03 (0.81–1.33) | 1.01 (0.81–1.26) | 0.8 (0.56–1.14) |
| Other | 1.04 (0.82–1.33) | 1.09 (0.93–1.29) | 1.13 (0.94–1.36) |
| Number of chronic conditions | |||
| 0 | 1.00 | 1.00 | 1.00 |
| 1 | 1.13 (1.02–1.26) | 1.14 (1.08–1.21) | 1.09 (1.02–1.16) |
| ≥2 | 1.19 (1.08–1.31) | 1.20 (1.09–1.32) | 1.10 (1.00–1.21) |
Only patients who logged into MyChart were included in these models. These are incidence rate ratios, not odds ratios. We fit a separate zero-inflated maximum-likelihood Poisson model to estimate the number of each of the 3 activities. Models accounted for clustering of patients within service areas by including robust clustered sandwich estimators of variance to estimate rate ratio confidence intervals. Bold values are statistically significant at P < .05.
CI, confidence interval; FPL, federal poverty level.