Table 3.
Predictors of Ever and Current E-cigarette Use*
| Ever vs. never use aOR (95% CI) | Current vs. former use aOR (95% CI) | |
|---|---|---|
| Age | 0.95 (0.93–0.98) | 1.01 (0.98–1.03) |
| Female sex | 1.13 (0.63–2.01) | 0.52 (0.25–1.07) |
| Non-Hispanic white race/ethnicity | 1.01 (0.56–1.82) | 1.17 (0.61–2.25) |
| Level of education | ||
| Less than high school | 0.66 (0.27–1.63) | 1.74 (0.53–5.73) |
| High school diploma/GED | 1.13 (0.47–2.75) | 1.24 (0.40–3.80) |
| Some college | 1.11 (0.49–2.50) | 1.23 (0.43–3.56) |
| 4 Year degree or higher | ref | ref |
| Medicaid insurance | 1.36 (0.82–2.26) | 1.88 (0.97–3.62) |
| Clinic site | ||
| UCSF GIM | ref | ref |
| SFGH GMC | 0.40 (0.17–0.92) | 1.02 (0.43–2.46) |
| PHP | 0.45 (0.21–0.97) | 0.96 (0.44–2.09) |
| Daily smoker | 1.38 (0.68–2.80) | 0.69 (0.29–1.64) |
| Cigarettes per day | 1.02 (0.99–1.06) | -- |
| Interest in quitting | ||
| Within next month/already quit | ref | -- |
| Maybe in 6 months | 0.81 (0.45–1.47) | -- |
| Do not know/not interested | 0.59 (0.30–1.15) | -- |
| First cigarette within 30 min of waking | 1.06 (0.59–1.90) | 0.69 (0.36–1.34) |
| Comorbid conditions† | ||
| Hypertension | 0.59 (0.33–1.07) | -- |
| Ischemic heart disease | 1.13 (0.58–2.19) | -- |
| Cancer | 0.68 (0.33–1.38) | 0.58 (0.21–1.61) |
| Mental illness | 1.11 (0.60–2.04) | -- |
| Alcohol dependence | 0.92 (0.51–1.69) | -- |
GED = General Educational Development; UCSF GIM = University of California San Francisco General Internal Medicine Clinic; SFGH GMC = San Francisco General Hospital General Medicine Clinic; PHP = UCSF Positive Health Practice at San Francisco General Hospital; ref. = referent group
*Ever e-cigarette use is defined as having ever tried even one puff of an e-cigarette; former e-cigarette use is defined as having ever tried an e-cigarette, but no use in the past 30 days; current e-cigarette use is defined as use within the past 30 days
†HIV not included in regression models because almost all participants with HIV were seen in the PHP clinic
--: Not included in model because p > 0.2 in univariate analyses
Boldface indicates statistical significance (p < 0.05)