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​2011 Kaiser Permanente Adult Member Health Survey Report for the Northern California Region Membership

The region reports profile the adult Health Plan membership aged 20 and over in the Northern California region, based on self-reported data collected through mailed surveys of random samples of adult Health Plan members from 19 medical center service populations in spring 2011.

2011 Northern California Region Report

Sociodemographic and Health-Related Characteristics of Members Aged 65 and Over in Kaiser Permanente's Northern California Region, 2011 (February 2013)


The 2011 survey was sent to a random sample of 44,000 adult health plan members aged 20 and over beginning in mid-April 2011. Sample selection was stratified by gender by five age groups (20-44, 45-64, 65-74, 75-79, 80+) by 19 medical center service populations (MCSPs). We used resultant oversampling of seniors and smaller MCSPs.

The survey questionnaire could be completed in print or online. The survey sample was sent up to three survey mailings over a five-month period. We also provided the URL to complete the survey online. In addition, the 66 percent of target members who had a registered email address with the website and had not opted out of being contacted for surveys by email were sent an email containing links to the online survey.

Members whose preferred spoken or written language was designated as a language other than English were excluded from the sampling process.

The overall survey response rate was 39.2 percent, but response varied by age group: 24 percent for ages 20-44 (30 percent for women, 19 percent for men), 41 percent for ages 45-64 (45 percent for women, 37 percent for men), and about 69 percent for ages 65 and over (no gender difference).

Contact us

Check here for announcements of new reports that have been posted to the website. For more information about timing and topics or to make special requests for statistics based on the 2011 survey, contact Nancy Gordon, Member Health Survey director, at: