Table 3.
Self-Reported Adverse Respiratory Symptoms by Frequency of E-Cigarette Use
| Connecticut Adolescents | Northern California Adolescents | Southern California Young Adults: CHS1 | Southern California Young Adults: HH2 | |||||
|---|---|---|---|---|---|---|---|---|
| %3 | AOR4 (95% CI) | %3 | AOR4 (95% CI) | %3 | AOR4 (95% CI) | %3 | AOR4 (95% CI) | |
| Outcome: Bronchitis 5,6 | ||||||||
| E-cigarette use categories:7 | ||||||||
| Never used e-cigarettes | 21.4 | reference | 26.0 | reference | 20.1 | reference | 14.2 | reference |
| Ever used but 0 days in past 30 days | 21.7 | 1.01 (0.83, 1.22) | 28.9 | 1.11 (0.77, 1.60) | 26.6 | 1.21 (0.90, 1.62) | 17.0 | 1.02 (0.75, 1.39) |
| 1–5 days in past 30 days | 23.7 | 1.13 (0.91, 1.40) | 32.9 | 1.14 (0.79, 1.65) | 33.8 | 1.25 (0.70, 2.23) | 15.9 | 0.89 (0.54, 1.45) |
| 6–30 days in past 30 days | 30.0 | 1.57 (1.30, 1.89) | 43.0 | 1.52 (1.22, 1.90) | 42.5 | 2.07 (1.23, 3.49) | 23.2 | 1.34 (0.89, 2.01) |
| Outcome: Asthma 5,6 | ||||||||
| E-cigarette use categories:7 | ||||||||
| Never used e-cigarettes | 16.3 | reference | 17.3 | reference | 14.7 | reference | 14.6 | reference |
| Ever used but 0 days in past 30 days | 15.0 | 0.90 (0.72, 1.12) | 20.5 | 1.15 (0.73, 1.82) | 16.0 | 0.92 (0.66, 1.30) | 18.1 | 1.17 (0.86, 1.58) |
| 1–5 days in past 30 days | 20.1 | 1.27 (1.01, 1.59) | 17.0 | 0.76 (0.48, 1.17) | 32.5 | 1.78 (0.96, 3.28) | 25.2 | 1.67 (1.09, 2.57) |
| 6–30 days in past 30 days | 26.7 | 1.85 (1.52, 2.26) | 22.5 | 0.98 (0.59, 1.64) | 27.9 | 1.61 (0.89, 2.93) | 18.5 | 1.04 (0.68, 1.58) |
| Outcome: Shortness of breath 5,6 | ||||||||
| E-cigarette use categories:7 | ||||||||
| Never used e-cigarettes | 17.9 | reference | 19.4 | reference | 15.2 | reference | 18.2 | reference |
| Ever used but 0 days in past 30 days | 19.9 | 1.10 (0.90, 1.35) | 17.3 | 0.81 (0.57, 1.14) | 18.9 | 1.24 (0.90, 1.73) | 22.7 | 1.15 (0.87, 1.52) |
| 1–5 days in past 30 days | 22.4 | 1.23 (0.98, 1.53) | 18.0 | 0.77 (0.45, 1.32) | 23.4 | 1.92 (0.99, 3.73) | 26.3 | 1.56 (1.02, 2.40) |
| 6–30 days in past 30 days | 28.5 | 1.87 (1.53, 2.28) | 35.9 | 1.88 (1.37, 2.59) | 11.5 | 0.89 (0.41, 1.92) | 22.7 | 1.42 (0.95, 2.11) |
Children’s Health Study
Happiness and Health Study
Prevalence of the respiratory outcome in each e-cigarette use category
Odds ratios from logistic regression models adjusted for gender, race/ethnicity, school lunch program participation (adolescents), personal income (young adults), age, past 30-day combustible tobacco, past 30-day use of cannabis. Missing covariable values multiply imputed for California samples.
Composite outcome, including ≥1 symptom (see: Table 2)
Bold text in table cells indicates statistically significant (P<0.05) difference in odds of the respiratory outcome compared to reference, calculated separately for each study
Based on number of days used the most-frequently used e-cigarette device type
Abbreviations: AOR = adjusted odds ratio; CI = confidence interval