Table 2.
Weighted Logistic Regression Analysis of the Effect of the Medicaid Expansion on Smoking Cessation (N=8,523)
| Unadjusted for state controlsa |
Adjusted for state controlsb | ||||
|---|---|---|---|---|---|
| Variable | Probability in expansion states pre- ACA |
Change in probability with expansion (95% CI) |
Change in relative risk with expansion (95% CI) |
Change in probability with expansion (95% CI) |
Change in relative risk with expansion (95% CI) |
| Quit attempts | 0.383 | 0.010 (−0.05,0.07) | 1.01 (0.87,1.17) | −0.019 (−0.09, 0.05) | 0.95 (0.79,1.11) |
| 30-day cessation | 0.070 | 0.014 (−0.01,0.04) | 1.22 (0.69,1.76) | 0.003 (−0.03,0.03) | 1.04 (0.56,1.53) |
| 90-day cessation | 0.056 | 0.010 (−0.02,0.04) | 1.17 (0.60,1.75) | −0.001 (−0.03, 0.03) | 0.98 (0.48,1.48) |
Notes: Column 2 provides a baseline estimate of the probability for each outcome in expansion states before the Medicaid expansion. Estimates were generated from a logistic regression, probability weighted by the product of each individual’s propensity score and TUS-CPS self-respondent weight. SEs used in CI estimation were clustered at the state level and calculated using the delta method. The authors estimate the effect of the Medicaid expansion as changes in probability (average marginal effects) and changes in RRs associated with the interaction term between Medicaid expansion states and the 2014/2015 TUS-CPS waves.
Columns 3 and 4 report estimates before adjusting for state-level controls.
Columns 5 and 6 report estimates after adjusting for state-level controls including state/year unemployment rates, poverty rates, earned income tax credit (EITC) as a percentage of federal EITC, maximum temporary assistance for needy families benefit for a family of two, minimum wage, cigarette taxes per pack, percentage of residents covered by comprehensive smoke-free laws, number of cessation aids covered by Medicaid, number of nicotine replacement therapies (NRTs) offered by Medicaid, and number of barriers to cessation aids and NRTs within Medicaid.
ACA, Affordable Care Act; TUS-CPS, Tobacco Use Supplement-Current Population Survey.