Table 2

Population characteristics

Nonverified*MyGroupHealth identity verifiedSecure messaging users
1–3 threads4–11 threads≥12 threads
n10,1532,3501,892814218
Male sex5245464949
Age (years)64 ± 1360 ± 1258 ± 1257 ± 1257 ± 11
    <351.92.23.23.14.1
    35–491215172421
    50–643646525053
    ≥655037282322
Low neighborhood SES2520201924
Distance to clinic (miles)9.6 ± 6910 ± 8513 ± 1087.8 ± 9.77.9 ± 11
Rural3.03.23.44.03.7
Insurance
    Commercial4658687365
    Medicare5240312633
    Medicaid, Basic Health Plan1.92.00.90.41.8
Expected resource use
    None or low5.85.83.82.70.5
    Moderate4850514622
    High2626283038
    Very high2118182139
Depression visits0.69 ± 2.70.86 ± 3.60.83 ± 4.11.1 ± 4.32.5 ± 8.9
Diabetes complications1.5 ± 1.11.4 ± 1.11.3 ± 1.11.3 ± 1.11.8 ± 1.0
Quarters with any secure messagingN/A01.5 ± 0.673.2 ± 1.04.4 ± 0.85
Patient's ratio of secure messaging threads: all encountersN/A00.20 ± 0.140.41 ± 0.170.54 ± 0.16
PCP ratio of secure messaging threads: all encounters0.14 ± 0.070.14 ± 0.070.16 ± 0.080.18 ± 0.090.19 ± 0.10
PCP male sex7273716867
Panel size1,408 ± 3631,434 ± 3661,403 ± 3561,375 ± 3561,382 ± 351
Tenure with PCP (years)6.2 ± 5.26.1 ± 5.26.2 ± 5.26.1 ± 5.36.2 ± 5.1
A1C (%)7.8 ± 1.67.7 ± 1.67.6 ± 1.57.6 ± 1.57.5 ± 1.6
    <73436373845
Blood pressure (mmHg)134/74 ± 20/11133/75 ± 19/11132/75 ± 18/11132/76 ± 18/11132/75 ± 19/11
    <130/803335363436
LDL cholesterol (mg/dl)96 ± 3595 ± 3495 ± 3594 ± 3693 ± 34
    <1008082818183
Outpatient visits9.5 ± 149.4 ± 149.7 ± 1412 ± 1518 ± 20
    Primary care4948474542
    Specialty care4749515355
    Emergency4.63.63.13.24.1
  • Data are % or means ± SD.

  • *Patients with no MyGroupHealth Web site registration or only basic username/password registration.

  • †Patients who registered to use the MyGroupHealth Web site and completed secondary identity verification but never used secure messaging.

  • ‡Annualized visits. SES, socioeconomic status.