---
title: "Methodology"
description: "The 2012 Health Survey, sponsored by the Pew Research Center’s Internet & American Life Project and the California HealthCare Foundation, obtained telephone interviews with a nationally representative sample of 3,014 adults living in the United States. Telephone interviews were conducted by landline (1,808) and cell phone (1,206, including 624 without a landline phone). The survey […]"
date: "2013-01-15"
authors:
  - name: "Susannah Fox"
    job_title: "Former Researcher"
    link: "https://www.pewresearch.org/staff/susannah-fox/"
  - name: "Maeve Duggan"
    job_title: "Former Research Associate"
    link: "https://www.pewresearch.org/staff/maeve-duggan/"
url: "https://www.pewresearch.org/internet/2013/01/15/methodology-7-7/"
---

# Methodology

The 2012 Health Survey, sponsored by the Pew Research Center’s Internet & American Life Project and the California HealthCare Foundation, obtained telephone interviews with a nationally representative sample of 3,014 adults living in the United States. Telephone interviews were conducted by landline (1,808) and cell phone (1,206, including 624 without a landline phone). The survey was conducted by Princeton Survey Research Associates International. Interviews were done in English and Spanish by Princeton Data Source from August 7 to September 6, 2012. Statistical results are weighted to correct known demographic discrepancies. The margin of sampling error for the complete set of weighted data is ±2.4 percentage points.

A complete explanation of the survey design and data collection procedures can be found in the PDF of the [topline ](https://www.pewresearch.org/wp-content/uploads/sites/20/2013/01/Pew-Internet-Health-Online-topline.pdf)or of the [report](https://www.pewresearch.org/wp-content/uploads/sites/20/2013/01/PIP_HealthOnline.pdf).