Table 5.
Hierarchical logistic regression models.
| E-cigarette use and past 12-month NSSI (weighted N = 47,016) | ||||
|---|---|---|---|---|
|
Model 1 OR (95% CI) |
Model 2 aOR (95% CI) |
Model 3 aOR (95% CI) |
Model 4 aOR (95% CI) |
|
| Exposure of interest | ||||
| Electronic cigarette use | 1.92 (1.76, 2.10) | 1.77 (1.61, 1.93) | 1.54 (1.40, 1.70) | 1.27 (1.14, 1.40) |
| Demographics | ||||
| Gender (Female) | – | 1.29 (1.19, 1.40) | 1.07 (0.98, 1.16) | 1.09 (0.99, 1.18) |
| Age (18–25 years) | – | 2.58 (2.29, 2.91) | 2.49 (2.20, 2.82) | 2.60 (2.30, 2.95) |
| Race (White) | – | 1.02 (0.94, 1.11) | – | – |
| Psychiatric symptoms | ||||
| Moderate–Severe depression | – | – | 2.76 (2.48, 3.06) | 2.69 (2.42, 2.99) |
| Moderate–Severe anxiety | – | – | 2.46 (2.24, 2.70) | 2.45 (2.32, 2.69) |
| Substance use | ||||
| Conventional cigarette use | – | – | – | 1.67 (1.46, 1.90) |
| Alcohol use | – | – | – | 1.07 (0.98, 1.16) |
| Use of other substances* | – | – | – | 1.49 (1.26, 1.75) |
| E-liquid inhaled and past 12-month NSSI (weighted N = 8,358) | ||||
| Exposure of interest | ||||
| THC E-Liquid (vs. “just flavoring”) | 1.69 (1.19 2.40) | 1.81 (1.27, 2.58) | 1.82 (1.23, 2.70) | 1.66 (1.11, 2.47) |
| Nicotine E-Liquid (vs. “just flavoring”) | 1.23 (0.90, 1.68) | 1.32 (0.96, 1.82) | 1.36 (0.96, 1.93) | 1.09 (0.77, 1.54) |
| Demographics | ||||
| Gender (Female) | – | 1.38 (1.17, 1.64) | 1.11 (0.92, 1.32) | – |
| Age (18–25 years) | – | 2.34 (1.69, 3.24) | 2.35 (1.63, 3.38) | 2.53 (1.73, 3.70) |
| Race (White) | – | 0.74 (0.62, 0.88) | 0.83 (0.68, 1.00) | – |
| Psychiatric symptoms | ||||
| Moderate–Severe depression | – | – | 2.80 (2.27, 3.45) | 2.73 (2.21, 3.36) |
| Moderate–Severe anxiety | – | – | 2.36 (1.94, 2.87) | 2.42 (1.99, 2.94) |
| Substance use | ||||
| Conventional cigarette use | – | – | – | 1.87 (1.53, 2.27) |
| Alcohol use | – | – | – | 0.92 (0.73, 1.15) |
| Use of other substances* | – | – | – | 1.41 (1.12, 1.78) |
| E-cigarette use and frequent NSSI (i.e., 2 or more times per month; weighted N = 10,354) | ||||
| Exposure of interest | ||||
| Electronic cigarette use | 0.77 (0.63, 0.93) | 0.76 (0.62, 0.92) | 0.69 (0.57, 0.83) | 0.73 (0.60, 0.90) |
| Demographics | ||||
| Gender (Female) | – | 1.00 (0.83, 1.20) | – | – |
| Age (18–25 years) | – | 1.25 (0.94, 1.70) | – | – |
| Race (White) | – | 1.02 (0.85, 1.21) | – | – |
| Psychiatric symptoms | ||||
| Moderate–Severe depression | – | – | 2.06 (1.68, 2.53) | 2.05 (1.67, 2.52) |
| Moderate–Severe anxiety | – | – | 1.52 (1.23, 1.88) | 1.51 (1.22, 1.88) |
| Substance use | ||||
| Conventional cigarette use | – | – | – | 0.95 (0.75, 1.22) |
| Alcohol use | – | – | – | 0.77 (0.65, 0.92) |
| Use of other substances* | – | – | – | 1.10 (0.81, 1.49) |
*
Not including marijuana.