Adjusted prevalence of current heated tobacco (HTP) use (use in previous 30 days) from 2015 to 2019 in Japan
| Characteristics at 2015 baseline | n | % | Adjusted number and percentage (95% CI) of HTP use* | |||||||||
| 2015 | 2016† | 2017 | 2018 | 2019 | ||||||||
| Total | 8240 | 100 | 13.5 | 0.2 (NC) | 62.0 | 0.8 (0.4 to 0.1) | 301.5 | 3.7 (2.8 to 4.8) | 661.1 | 8.0 (6.5 to 9.8) | 928.8 | 11.3 (9.3 to 13.6) |
| Gender | ||||||||||||
| Men | 4084 | 49.6 | 12.5 | 0.3 (NC) | 48.6 | 1.2 (0.6 to 2.3) | 225.1 | 5.6 (4.0 to 7.8) | 497.5 | 12.3 (9.7 to 15.5) | 694.2 | 17.2 (14.0 to 21.1) |
| Women | 4156 | 50.4 | 1.0 | 0 (NC) | 13.4 | 0.3 (0.1 to 0.8) | 76.4 | 1.8 (0.1 to 3.1) | 163.6 | 3.9 (2.7 to 5.7) | 234.6 | 5.6 (3.8 to 8.2) |
| Age (years) | ||||||||||||
| 15–19 | 881 | 10.7 | 4.9 | 0.6 (NC) | 13.2 | 2.0 (0.3 to 12.1) | 8.4 | 1.4 (0.4 to 5.5) | 38.5 | 7.4 (2.7 to 18.7) | 18.3 | 4.8 (1.7 to 12.4) |
| 20–29 | 1462 | 17.7 | 3.5 | 0.2 (NC) | 16.3 | 1.0 (0.5 to 2.2) | 86.4 | 5.7 (3.2 to 10.0) | 210.5 | 14.1 (9.1 to 20.8) | 266.3 | 17.0 (11.3 to 24.7) |
| 30–39 | 1465 | 17.8 | 4.3 | 0.3 (NC) | 19.2 | 1.2 (0.5 to 2.7) | 87.7 | 5.1 (3.1 to 8.4) | 152.3 | 9.0 (5.9 to 12.5) | 254.7 | 15.2 (10.4 to 21.6) |
| 40–49 | 1487 | 18.1 | 0 | 0 (NC) | 6.3 | 0.4 (0.1 to 1.5) | 61.8 | 4.0 (2.1 to 7.4) | 132.9 | 8.5 (5.7 to 12.5) | 211.3 | 12.5 (8.8 to 17.5) |
| 50–59 | 1461 | 17.7 | 0.5 | 0 (NC) | 6.2 | 0.5 (0.1 to 2.0) | 49.0 | 3.5 (1.9 to 6.6) | 95.2 | 6.8 (4.5 to 10.2) | 129.1 | 9.1 (6.0 to 13.7) |
| 60–69 | 1484 | 18.0 | 0.3 | 0 (NC) | 0.8 | 0.1 (0 to 2.3) | 8.4 | 0.6 (0.1 to 3.4) | 31.6 | 2.0 (0.9 to 4.6) | 49.1 | 3.3 (1.8 to 6.0) |
| Cigarette smoking status | ||||||||||||
| Never smoker | 4941 | 60.0 | 0.2 | 0 (NC) | 13.2 | 0.3 (0.1 to 0.7) | 65.2 | 1.3 (0.9 to 2.1) | 132.4 | 2.7 (1.8 to 4.2) | 129.5 | 2.7 (1.7 to 4.2) |
| Former smoker | 1608 | 19.5 | 4.8 | 0.3 (NC) | 29.1 | 1.8 (0.7 to 4.6) | 35.1 | 2.1 (0.9 to 4.5) | 67.5 | 4.0 (2.2 to 7.2) | 59.2 | 3.7 (1.8 to 7.3) |
| Smoker with intention to quit | 279 | 3.4 | 1.6 | 0.6 (NC) | 2.4 | 1.1 (0.3 to 4.2) | 45.1 | 18.4 (8.4 to 35.8) | 55.4 | 22.0 (11.4 to 38.3) | 64.0 | 30.8 (16.0 to 51.0) |
| Smoker without intention to quit | 1412 | 17.1 | 6.9 | 0.5 (NC) | 17.3 | 1.2 (0.5 to 0.3) | 156 | 11.0 (7.3 to 16.2) | 405.8 | 27.5 (21.4 to 34.6) | 676.1 | 43.2 (35.7 to 51.0) |
*Adjusted for ‘being a respondent in an internet survey’ using a nationally representative sample in Japan.
†Adjusted for non-response in 2016 survey or after in addition to adjustment* for ‘being an internet survey respondent’.
NC, not counted.