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Table 4 Odds Ratios from weighted multivariate logistic regression analysis predicting ease of cigarette purchase among Korean adolescents, KYRBWS 2014–2016 (N = 16,268)

From: Trends in the ease of cigarette purchase among Korean adolescents: evidence from the Korea youth risk behavior web-based survey 2005–2016

  Crude Multi-adjusted
OR 95% CI OR 95% CI
Year
 2014 1.00 1.00
 2015 1.15 (1.04–1.28) 0.98 (0.84–1.14)
 2016 0.75 (0.68–0.83) 0.85 (0.73–1.00)
Sex
 Adolescent males 1.00 1.00
 Adolescent females 0.82 (0.74–0.90) 1.01 (0.86–1.18)
Grade
 Middle 1 1.00 1.00
 Middle 2 2.71 (2.18–3.37) 1.43 (0.96–2.13)
 Middle 3 5.14 (4.12–6.42) 2.05 (1.39–3.03)
 High 1 8.63 (6.97–10.67) 2.79 (1.93–4.04)
 High 2 11.01 (8.92–13.60) 3.08 (2.14–4.44)
 High 3 14.23 (11.52–17.58) 3.64 (2.52–5.25)
Area
 Rural 1.00 1.00
 Urban (small and medium sized cities) 1.04 (0.89–1.23) 1.15 (0.93–1.43)
 Urban (metropolitan cities) 1.14 (0.97–1.34) 1.32 (1.06–1.64)
Self-reported socioeconomic status
 High 1.00 1.00
 Middle 1.02 (0.90–1.16) 0.98 (0.78–1.23)
 Low 1.55 (1.27–1.88) 0.96 (0.71–1.30)
Problematic drinking in the past year
 No 1.00 1.00
 Yes 4.34 (3.97–4.73) 1.55 (1.36–1.78)
Average amount of cigarette smoking per day
  < 1 cigarette 1.00 1.00
 1 cigarette 1.02 (0.80–1.30) 0.98 (0.76–1.28)
 2–5 cigarettes 1.87 (1.55–2.26) 1.55 (1.27–1.90)
 6–9 cigarettes 3.79 (3.04–4.72) 2.84 (2.24–3.59)
 10–19 cigarettes 5.50 (4.27–7.08) 4.29 (3.26–5.65)
  ≥ 20 cigarettes 6.58 (4.75–9.10) 5.10 (3.56–7.31)
Quit attempts in the past year
 No 1.00 1.00
 Yes 0.85 (0.74–0.98) 0.96 (0.82–1.11)
Current smokers among family members
 No 1.00 1.00
 Yes 1.16 (1.07–1.26) 0.87 (0.76–0.99)
Current smokers among close friends
 No 1.00 1.00
 Yes 9.01 (8.02–10.13) 1.66 (1.22–2.27)
Pocket money (won/week)a
  < 30,000 1.00 1.00
 30,000-59,999 1.81 (1.65–1.98) 1.27 (1.10–1.46)
 60,000-89,999 2.39 (2.02–2.84) 1.13 (0.88–1.45)
 90,000-119,999 2.62 (2.10–3.27) 1.32 (0.97–1.79)
 120,000-149,999 3.89 (2.40–6.30) 2.90 (1.19–7.06)
  ≥ 150,000 3.11 (2.58–3.74) 1.48 (1.09–2.01)
  1. aCurrency exchange for U.S. dollar: 30,000 won = $26.88; 60,000 won = $53.75; 90,000 won = $80.63; 120,000 won = $107.51; 150,000 won = $134.38
  2. KYRBWS: Korean Youth Risk Behavior Web-Based Survey