Percentage of Chinese adults ≥15 years old who had heard of e-cigarettes by selected demographic characteristics
| Demographic characteristics | Heard of e-cigarettes | P value | |
| Percentage | (95% CI) | ||
| Overall | 48.5 | (46.0, 51.0) | |
| Gender | <0.0001 | ||
| Male | 59.1 | (56.2, 61.9) | |
| Female | 37.7 | (35.1, 40.4) | |
| Age (year) | <0.0001 | ||
| 15–24 | 69.9 | (65.7, 73.9) | |
| 25–44 | 62.5 | (59.1, 65.8) | |
| 45–64 | 37.2 | (34.6, 39.9) | |
| 65+ | 16.9 | (14.7, 19.4) | |
| Residence | <0.0001 | ||
| Urban | 56.3 | (53.2, 59.3) | |
| Rural | 37.0 | (33.8, 40.3) | |
| Educational level | <0.0001 | ||
| Elementary school and below | 17.1 | (15.4, 18.9) | |
| Middle school | 48.0 | (45.1, 50.8) | |
| High school | 61.7 | (58.2, 65.0) | |
| College/university or above | 77.0 | (73.7, 80.0) | |
| Smoking status | <0.0001 | ||
| Never smoker | 42.8 | (40.1, 45.5) | |
| Current smoker | 62.3 | (59.1, 65.5) | |
| Daily smoker | 62.5 | (59.0, 66.0) | |
| Occasionally smoker | 61.1 | (54.7, 67.5) | |
| Former smoker | 51.3 | (47.6, 55.0) | |
| Income(yuan) | <0.0001 | ||
| <30 000 | 36.1 | (33.5, 38.7) | |
| 30 000–49999 | 48.7 | (45.1, 52.3) | |
| 50 000–99999 | 58.2 | (54.1, 62.4) | |
| 100 000 and above | 66.7 | (61.7, 71.8) | |