Table 3

Predictors of IQOS current use (IQOS use in the previous 30 days) in 2017 in Japan

Among total sampleAmong HNB tobacco/e-cigarette never-users at baseline
Characteristics at 2015 baselineAdjusted ORs* (95% CI)Adjusted ORs* (95% CI)
Sex
 Men1 (reference)1 (reference)
 Women0.48 (0.21 to 1.05) 0.28 (0.10 to 0.77)
Age groups, years
 15–191 (reference)1 (reference)
 20–291.88 (0.53 to 6.60)2.76 (0.76 to 10.06)
 30–391.53 (0.36 to 6.59)1.58 (0.32 to 7.91)
 40–490.81 (0.20 to 3.34)1.20 (0.29 to 4.99)
 50–591.25 (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-smoker1 (reference)1 (reference)
 Former smoker1.79 (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 ban1.58 (0.65 to 3.86)1.76 (0.63 to 4.91)
 Not working/did not know1.27 (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 use1 (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 quartile0.89 (0.30 to 2.62)0.48 (0.12 to 1.85)
 3rd quartile1.79 (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 answer1.11 (0.27 to 4.52)1.36 (0.38 to 4.89)
Housing tenure
 Does not own housing1 (reference)1 (reference)
 Owns housing0.58 (0.28 to 1.19)0.60 (0.27 to 1.33)
Education
 Junior high school/high school1 (reference)1 (reference)
 University/technical school/college or more0.95 (0.41 to 2.23)1.13 (0.43 to 2.95)
Marital status
 Married1 (reference)1 (reference)
 Never married0.99 (0.47 to 2.10)0.88 (0.38 to 2.07)
 Divorced/widowed0.34 (0.05 to 2.27)0.58 (0.08 to 3.99)
Alcohol consumption
 Never-drinker1 (reference)1 (reference)
 Former drinker0.72 (0.20 to 2.57)0.50 (0.11 to 2.35)
 Current drinker0.44 (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 quartile2.09 (0.77 to 5.70) 3.76 (1.31 to 10.8)
 3rd quartile1.38 (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 seen1 (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 seen1 (reference)1 (reference)
 Often or very often seen2.44 (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.