Predictors of IQOS current use (IQOS use in the previous 30 days) in 2017 in Japan
| Among total sample | Among HNB tobacco/e-cigarette never-users at baseline | |
| Characteristics at 2015 baseline | Adjusted ORs* (95% CI) | Adjusted ORs* (95% CI) |
| Sex | ||
| Men | 1 (reference) | 1 (reference) |
| Women | 0.48 (0.21 to 1.05) | 0.28 (0.10 to 0.77) |
| Age groups, years | ||
| 15–19 | 1 (reference) | 1 (reference) |
| 20–29 | 1.88 (0.53 to 6.60) | 2.76 (0.76 to 10.06) |
| 30–39 | 1.53 (0.36 to 6.59) | 1.58 (0.32 to 7.91) |
| 40–49 | 0.81 (0.20 to 3.34) | 1.20 (0.29 to 4.99) |
| 50–59 | 1.25 (0.25 to 6.17) | 1.36 (0.24 to 7.66) |
| 60–69 | 0.01 (0.00 to 0.10) | 0.00 (0.00 to 0.05) |
| Smoking status | ||
| Never-smoker | 1 (reference) | 1 (reference) |
| Former smoker | 1.79 (0.70 to 4.60) | 1.02 (0.34 to 3.03) |
| Current smoker with intention to quit | 13.3 (3.08 to 57.4) | 18.5 (3.37 to 102.0) |
| Current smoker with no intention to quit | 6.74 (2.52 to 18.0) | 11.4 (3.98 to 32.8) |
| Workplace indoor smoking ban status | ||
| No ban (including smoking room/corner) | 1 (reference) | 1 (reference) |
| Complete ban | 1.58 (0.65 to 3.86) | 1.76 (0.63 to 4.91) |
| Not working/did not know | 1.27 (0.45 to 3.55) | 1.54 (0.46 to 5.19) |
| HNB tobacco/e-cigarette use status | ||
| Never used with no preference for e-cigarette use | 1 (reference) | 1 (reference) |
| Never used but would like to use e-cigarette in future | 4.16 (1.44 to 12.0) | 3.58 (1.26 to 10.2) |
| Ever-user | 3.85 (1.42 to 10.5) | – |
| Equivalent household income | ||
| 1st quartile (lowest) | 1 (reference) | 1 (reference) |
| 2nd quartile | 0.89 (0.30 to 2.62) | 0.48 (0.12 to 1.85) |
| 3rd quartile | 1.79 (0.70 to 4.58) | 1.69 (0.64 to 4.41) |
| 4th quartile (highest) | 2.09 (0.83 to 5.24) | 1.72 (0.63 to 4.70) |
| Did not know/did not want to answer | 1.11 (0.27 to 4.52) | 1.36 (0.38 to 4.89) |
| Housing tenure | ||
| Does not own housing | 1 (reference) | 1 (reference) |
| Owns housing | 0.58 (0.28 to 1.19) | 0.60 (0.27 to 1.33) |
| Education | ||
| Junior high school/high school | 1 (reference) | 1 (reference) |
| University/technical school/college or more | 0.95 (0.41 to 2.23) | 1.13 (0.43 to 2.95) |
| Marital status | ||
| Married | 1 (reference) | 1 (reference) |
| Never married | 0.99 (0.47 to 2.10) | 0.88 (0.38 to 2.07) |
| Divorced/widowed | 0.34 (0.05 to 2.27) | 0.58 (0.08 to 3.99) |
| Alcohol consumption | ||
| Never-drinker | 1 (reference) | 1 (reference) |
| Former drinker | 0.72 (0.20 to 2.57) | 0.50 (0.11 to 2.35) |
| Current drinker | 0.44 (0.18 to 1.10) | 0.34 (0.13 to 0.88) |
| Self-rated health | ||
| Good (excellent/very good/good) | 1 (reference) | 1 (reference) |
| Poor (fair/poor) | 1.42 (0.53 to 3.85) | 1.95 (0.65 to 5.88) |
| Areal deprivation index of living place | ||
| 1st quartile (least deprived) | 1 (reference) | 1 (reference) |
| 2nd quartile | 2.09 (0.77 to 5.70) | 3.76 (1.31 to 10.8) |
| 3rd quartile | 1.38 (0.52 to 3.64) | 1.32 (0.39 to 4.42) |
| 4th quartile (most deprived) | 2.79 (1.17 to 6.68) | 3.41 (1.17 to 9.94) |
| Missing/unknown | 4.57 (1.14 to 18.3) | 1.32 (0.15 to 11.37) |
| Experience of having seen the TV programme†‡ | ||
| Had not seen | 1 (reference) | 1 (reference) |
| Had seen | 3.08 (1.41 to 6.70) | 3.66 (1.65 to 8.08) |
| Awareness of tobacco company promotion† | ||
| Never, seldom or sometimes seen | 1 (reference) | 1 (reference) |
| Often or very often seen | 2.44 (0.75 to 7.97) | 3.03 (1.00 to 9.17) |
| Responded to reduced version§ | 0.63 (0.16 to 2.48) | 0.76 (0.16 to 3.57) |
*Adjusted for all listed variables.
†Information collected in 2017 survey.
‡An episode of a popular entertainment TV show introducing IQOS, broadcasted on 28 April 2016, in Japan (see methods section for detail).
§‘Responded to reduced version’ refers to responders who answered a question-reduced version that did not included some questions, such as on awareness of tobacco company promotion (n=194).
HNB, heat-not-burn.