Table 1.
Characteristics of Person-Interval Observations, Population Assessment of Tobacco and Health Study, 2013–2018a
| Overall (n = 29 788) | NH white (n = 14 025) | NH black (n = 4187) | Hispanic (n = 8824) | |
|---|---|---|---|---|
| %b | %b | %b | %b | |
| Exposure wavec | ||||
| Female | 48.7 | 48.1 | 50.2 | 48.8 |
| Age, y | ||||
| 12 | 18.6 | 18.3 | 16.6 | 19.8 |
| 13 | 18.4 | 18.2 | 17.9 | 19.0 |
| 14 | 17.8 | 17.9 | 18.1 | 17.7 |
| 15 | 16.9 | 17.2 | 17.1 | 16.6 |
| 16 | 15.3 | 15.5 | 16.3 | 14.6 |
| 17 | 12.9 | 12.9 | 13.9 | 12.4 |
| Parent completed college or higher | 40.1 | 50.3 | 28.2 | 17.8 |
| Lives with tobacco user | 31.6 | 33.9 | 36.7 | 25.2 |
| Frequency of noticing tobacco warnings | ||||
| Never | 55.5 | 56.8 | 54.3 | 53.3 |
| Rarely | 16.6 | 16.5 | 15.8 | 17.7 |
| Sometimes | 11.9 | 12.0 | 11.3 | 12.3 |
| Often | 8.6 | 8.3 | 8.6 | 8.9 |
| Very often | 7.4 | 6.5 | 10.0 | 7.8 |
| Ever used alcohol | 26.1 | 30.1 | 19.6 | 21.4 |
| Ever used marijuana | 2.4 | 2.1 | 2.1 | 3.5 |
| Ever abused prescription drugs | 6.6 | 5.9 | 8.7 | 6.7 |
| Plans to smoke in next yeard | 13.3 | 12.6 | 12.1 | 16.4 |
| Ever been curious about cigarettesd | 22.2 | 22.0 | 20.5 | 22.8 |
| Would smoke if offered cigarette by friendd | 15.3 | 15.2 | 12.7 | 17.8 |
| Ever usee | ||||
| E-cigarette | 6.3 | 6.5 | 5.2 | 6.8 |
| Cigar | 1.9 | 1.9 | 3.6 | 1.1 |
| Other non-cigarette tobacco product | 4.9 | 4.8 | 4.6 | 5.9 |
| Past-30-day use | ||||
| E-cigarette | 1.2 | 1.4 | 1.0 | 1.0 |
| Cigar | 0.4 | 0.4 | 0.9 | 0.2 |
| Other non-cigarette tobacco product | 0.9 | 0.9 | 0.8 | 0.9 |
| Single use (only ever one product) | ||||
| E-cigarette | 4.1 | 4.1 | 3.1 | 4.7 |
| Cigar | 0.7 | 0.6 | 2.1 | 0.5 |
| Other non-cigarette tobacco product | 2.7 | 2.5 | 2.5 | 3.6 |
| Poly use (>1 product types) | 2.2 | 2.5 | 2.1 | 1.9 |
| Outcome wave | ||||
| Cigarette use initiation | ||||
| Cigarette ever | 4.1 | 4.7 | 2.6 | 4.0 |
| Cigarette current | 2.0 | 2.3 | 1.3 | 1.8 |
e-cigarette, electronic cigarette; NH, non-Hispanic.
aPerson-interval count. Intervals included respondents with data for at least two consecutive exposure wave and outcome waves, creating the potential for up to three time-varying within-person observations per respondent (W1-W2, W2-W3, W3-W4).
bPercentages were weighted using the most recent sample weight available per person. Guidelines for the Restricted-Use Files of the Population Assessment of Tobacco and Health Study prohibit the reporting of cell counts.
cExposure wave is defined as the first wave within each interval. Follow-up was defined as the last wave within each interval, 1-year after baseline.
dFor cigarette-susceptibility questions, responses of not at all or definitely not were considered nonsusceptible. All other responses were considered susceptible.
eYouths were considered to have prior non-cigarette tobacco use if they started using e-cigarettes, cigars, or other non-cigarette tobacco products prior to the interval exposure wave.