How This Study Was Conducted
The Commonwealth Fund Biennial Health Insurance Survey, 2016, was conducted by Princeton Survey Research Associates International, with a random nationally representative sample of nonelderly adults collected from July 12, 2016, to November 20, 2016, and an oversampling of adults in the four largest states, California, Florida, New York, and Texas. The survey consisted of 25-minute telephone interviews in either English or Spanish with adults age 19 and older living in the continental United States. A combination of landline and cellular phone random-digit-dial samples was used to reach people.
The study was designed to generalize to the U.S. adult population and to allow for separate analyses of responses of low-income households as well as adults in the four largest states. Most of this analysis looks at adults ages 19 to 64 in the four largest states. The sample sizes are: California=716, Florida=663, New York=739, and Texas=699. Statistical results are weighted to correct for the stratified sample design, the overlapping landline and cellular phone sample frames, and disproportionate nonresponse that might bias results. Each state sample is weighted to match population parameters for sex by age, sex by education, age by education, race/ethnicity, population density, household telephone use, household size, and region, using the U.S. Census Bureau’s 2016 American Community Survey data.
The resulting weighted national sample is representative of the approximately 187.4 million U.S. adults ages 19 to 64 and has an overall margin of sampling error of +/– 1.9 percentage points at the 95 percent confidence level. The California sample has a margin of error of +/– 4.2 percentage points at the 95 percent confidence level; the Florida sample margin of sampling error is +/– 3.7 percentage points; the New York sample margin of sampling error is +/– 3.8 percentage points; and the Texas sample margin of sampling error is +/– 3.8 percentage points. The landline portion of the survey achieved a 10 percent response rate and the cellular phone component achieved an 8 percent response rate.
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Notes
1 D. Blumenthal and S. R. Collins, “Why One in Ten Americans Will Feel the Pain of ACA Repeal Without an Effective Replacement,” To the Point, The Commonwealth Fund, March 8, 2017.
2 Analysis of the Commonwealth Fund Biennial Health Insurance Survey, 2016; Office of the Assistant Secretary for Planning and Evaluation, About 2.5 Million People Who Currently Buy Coverage Off-Marketplace May Be Eligible for ACA Subsidies, ASPE Data Point (ASPE, Oct. 4, 2016); R. Rudowitz, S. Artiga, and K. Young, What Coverage and Financing Is at Risk Under Repeal of the ACA Medicaid Expansion? (Kaiser Commission on Medicaid and the Uninsured, Dec. 2016); and Centers for Medicare and Medicaid Services, 2017 Marketplace Open Enrollment Period Public Use Files (CMS, n.d.).
3 S. R. Collins, M. Z. Gunja, M. M. Doty, and S. Beutel, How the Affordable Care Act Has Improved Americans’ Ability to Buy Health Insurance on Their Own (The Commonwealth Fund, Feb. 2017). These estimates are in the range of those found in other recent surveys. The federal government and a number of private organizations including The Commonwealth Fund have used different surveys and methodologies aimed at measuring the change in insurance coverage as a result of the coverage expansions under the Affordable Care Act. Most recently, the Center for Disease Control and Prevention’s National Health Interview Survey found that in the first nine months of 2016, 8.8 percent of the U.S. population, or 28.2 million people, and 12.3 percent of adults ages 18 to 64, or 24.3 million people, were uninsured; see M. E. Martinez, E. P. Zammitti, and R. A. Cohen, Health Insurance Coverage: Early Release Estimates from the National Health Interview Survey, January–September 2016 (NHIS, Feb. 2017). Data from the U.S. Census Bureau’s Current Population Survey (CPS) showed that 12.6 percent of adults ages 19 to 64, or 24.3 million people, were uninsured in 2015 (http://www.census.gov/library/publications/2016/demo/p60-257.html; and analysis of 2015 Current Population Survey by Sherry Glied and Ougni Chakraborty of New York University for The Commonwealth Fund). The Commonwealth Fund reported in May 2016 using its ACA Tracking Survey that the uninsured rate among adults ages 19 to 64 had declined from 19.9 percent in July–September 2013 to 12.7 percent in February–April 2016, or by an estimated 24 million people (http://www.commonwealthfund.org/publications/issue-briefs/2016/may/aca-tracking-survey-access-to-care-and-satisfaction).
4 This is an update of P. W. Rasmussen, S. R. Collins, M. M. Doty, and S. Beutel, Health Care Coverage and Access in the Nation’s Four Largest States (The Commonwealth Fund, April 2015).
5 The state-level estimates from the Commonwealth Fund Biennial Health Insurance Survey are similar to those reported by Center for Disease Control and Prevention’s National Health Interview Survey (NHIS) in all three years, with the exception of New York in 2012, which is higher in the Biennial Survey than in NHIS. For this reason, we report the 2012 uninsured rate for New York using the NHIS estimate: R. A. Cohen and M. E. Martinez, Health Insurance Coverage: Early Release of Estimates from the National Health Interview Survey, 2012 (NHIS, June 2013). This estimate was similar to the estimate from the U.S. Census Bureau’s 1-Year American Community Survey (ACS), which reported a 10.9% uninsured rate in New York among all individuals: J. C. Smith and C. Medalia, Health Insurance Coverage in the United States: 2013 (CPS Reports, Sept. 2014).
6 The margin of sampling error in the Biennial Survey for each state was between 3.7 and 4.2 percentage points at the 95 percent level. This meant that the decline in the uninsured rate in Texas was not statistically significant in the Biennial. However, the declines in uninsured rates have been statistically significant in these states in the NHIS and ACS, which have much larger sample sizes.
7 The Biennial Survey estimates in 2016 were similar to those reported by the NHIS, which found that in the first nine months of 2016, the uninsured rate among 18–64-year-olds in California was 9.3%, in New York was 7.3%, in Florida was 19.5%, and in Texas was 24.7%: M. E. Martinez, E. P. Zammitti, and R. A. Cohen, Health Insurance Coverage: Early Release Estimates From the National Health Interview Survey, January-September 2016 (NHIS, Feb. 2017). The NHIS found that in 2014 the uninsured rate in California was 16.7%, 12.9% in New York, 23.0% in Florida, and 25.7% in Texas: R. A. Cohen and M. E. Martinez, Health Insurance Coverage: Early Release Estimates from the National Health Interview Survey, 2014 (NHIS, June 2015). The NHIS found that in 2012, the uninsured rate in California was 24.4%, 14.7% in New York, 28.9% in Florida, and 28.6% in Texas: R. A. Cohen and M. E. Martinez, Health Insurance Coverage: Early Release of Estimates from the National Health Interview Survey, 2012 (NHIS, June 2013). The estimates from the Biennial Health Insurance Survey, 2016, were also similar to those reported by the U.S. Census Bureau 1-Year American Community Survey (ACS), 2015. ACS reported uninsured rates for 19–64-year-olds in California as 12%, in Florida as 20%, in New York as 10%, and in Texas as 23%: S. L. Hayes, S. R. Collins, D. C. Radley, D. McCarthy, and S. Beutel, A Long Way in a Short Time: States’ Progress on Health Care Coverage and Access, 2013–2015 (The Commonwealth Fund, Dec. 2016).
8 For a recent 50-state analysis of changes in coverage and access, see D. C. Radley, D. McCarthy, and S. L. Hayes, Aiming Higher: Results from the Commonwealth Fund Scorecard on State Health System Performance, 2017 Edition (The Commonwealth Fund, March 2017).
9 All reported differences are statistically significant at the p≤0.05 level or better unless otherwise noted.
10 S. R. Collins, M. Z. Gunja, M. M. Doty, and S. Beutel, How the Affordable Care Act Has Improved Americans’ Ability to Buy Health Insurance on Their Own (The Commonwealth Fund, Feb. 2017).
11 The difference between New York and Florida is not significant. The difference between New York and Texas, Florida and Texas, California and Florida, and California and Texas is significant.
12U.S. Unauthorized Immigration Population Estimates (Pew Research Center, Nov. 3, 2016).
13 S. R. Collins, M. Z. Gunja, M. M. Doty, and S. Beutel, How the Affordable Care Act Has Improved Americans’ Ability to Buy Health Insurance on Their Own (The Commonwealth Fund, Feb. 2017).
14 The reported weighted (unadjusted) estimates are similar to regression-adjusted estimates.
15 S. R. Collins, M. Z. Gunja, M. M. Doty, and S. Beutel, How the Affordable Care Act Has Improved Americans’ Ability to Buy Health Insurance on Their Own (The Commonwealth Fund, Feb. 2017).
16 Insured adults in New York (28%) and California (26%) reported far lower rates of problems getting needed care in the past 12 months than did insured adults in Texas (41%) and Florida (38%).
17 S. R. Collins, D. C. Radley, M. Z. Gunja, and S. Beutel, The Slowdown in Employer Insurance Cost Growth: Why Many Workers Still Feel the Pinch (The Commonwealth Fund, Oct. 2016).
18 S. R. Collins, M. Z. Gunja, M. M. Doty, and S. Beutel, How the Affordable Care Act Has Improved Americans’ Ability to Buy Health Insurance on Their Own (The Commonwealth Fund, Feb. 2017).
19 The reported weighted (unadjusted) estimates are similar to regression-adjusted estimates.
20 R. Thomason and P. Long, “California’s Low Income Health Program: A Public-Private Partnership That Worked,” Health Affairs Blog, Feb. 14, 2014.
21 L. Norris, “New York and the ACA’s Medicaid Expansion,” Healthinsurance.org, Jan. 10, 2017.
Acknowledgments
The authors thank David Blumenthal, Kathleen Regan, Don Moulds, Barry Scholl, Eric Schneider, Meredith Brown, Arnav Shah, Deborah Lorber, Chris Hollander, Christine Haran, Paul Frame, and Jen Wilson of The Commonwealth Fund for helpful comments, data checking, and editorial support and design.
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