Table 1.
Wave 1 (Baseline) Characteristics of Study Population by Presence of Chronic Medical Conditions and E-cigarette Use Initiation by Wave 2a
| Any chronic medical condition | No chronic medical conditions | |||||
|---|---|---|---|---|---|---|
| Characteristics | E-cigarette initiation (n=317) % (95% CI) |
No
e-cigarette initiation (n=1,887) % (95% CI) |
p- value |
E-cigarette initiation (n=762) % (95% CI) |
No
e-cigarette initiation (n=4,156) % (95% CI) |
p- value |
| Age, years | <0.001 | <0.001 | ||||
| 18–34 | 26 (22, 31) | 21 (19, 23) | 54 (50, 58) | 42 (40, 43) | ||
| 45–54 | 49 (43, 56) | 38 (35, 40) | 36 (32, 40) | 40 (39, 41) | ||
| ≥55 | 25 (19, 31) | 42 (39, 44) | 10 (8, 13) | 18 (17, 20) | ||
| Female sex | 59 (52, 65) | 52 (49, 55) | 0.07 | 41 (37, 44) | 41 (40, 42) | 0.82 |
| Non-Hispanic white race/ethnicity | 73 (68, 78) | 69 (66, 71) | 0.11 | 74 (69, 77) | 67 (66, 69) | 0.01 |
| Education | 0.58 | 0.23 | ||||
| Less than high school | 21 (17, 25) | 21 (19, 23) | 13 (10, 15) | 15 (14, 16) | ||
| High school/GED | 36 (30, 42) | 39 (36, 41) | 40 (37, 44) | 40 (38, 42) | ||
| Some college or more | 43 (38, 49) | 41 (38, 43) | 47 (43, 51) | 45 (43, 47) | ||
| Income below federal poverty level | 46 (41, 52) | 40 (38, 43) | 0.04 | 38 (33, 44) | 36 (34, 38) | 0.39 |
| Region of residence | 0.85 | 0.10 | ||||
| Northeast | 18 (13, 23) | 19 (16, 22) | 16 (13, 19) | 19 (17, 20) | ||
| Midwest | 25 (20, 30) | 27 (23, 30) | 25 (21, 29) | 24 (23, 26) | ||
| South | 39 (33, 46) | 37 (34, 41) | 44 (39, 49) | 40 (38, 42) | ||
| West | 19 (14, 24) | 17 (15, 20) | 16 (13, 18) | 17 (15, 20) | ||
| Cigarettes per day, mean (SE) | 16.5 (0.7) | 15.0 (0.3) | 0.04 | 13.8 (0.4) | 12.8 (0.2) | 0.04 |
| First cigarette within 30 minutes of waking | 72 (66, 77) | 68 (65, 70) | 0.21 | 65 (61, 69) | 55 (53, 57) | <0.001 |
Notes: All n are unweighted and percentages are population-weighted. Boldface indicates statistical significance (p<0.05).
a
Data were missing as follows (unweighted): <1% for age and education, 7% for income, 2% for cigarettes per day, and 1% for first cigarette within 30 minutes of waking