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Table 1 Basic characteristics of the study participants in the KYRBWS 2005–2016 (N = 95,491)

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

  Ease of cigarette purchase  
Yes (n = 76,860) No (n = 18,631) p-valuea
N % N %  
Sex
 Adolescent males 54,496 80.8 13,205 19.2 0.691
 Adolescent females 22,364 80.7 5426 19.3
Grade
 Middle 1 2967 51.3 2889 48.7 <  0.001
 Middle 2 6338 65.1 3420 34.9
 Middle 3 10,372 74.6 3534 25.4
 High 1 16,758 83.3 3409 16.7
 High 2 20,040 86.6 3070 13.4
 High 3 20,385 90.0 2309 10.0
Area
 Rural 10,304 80.3 2567 19.7  
 Urban (small and medium sized cities) 30,841 80.2 7767 19.8 0.001
 Urban (metropolitan cities) 35,715 81.4 8297 18.6  
Self-reported socioeconomic status
 High 6351 79.7 1720 20.3  
 Middle 61,982 80.6 15,143 19.4 <  0.001
 Low 8527 83.2 1768 16.8  
Problematic drinking in the past year
 No 25,331 68.3 12,135 31.7 <  0.001
 Yes 51,529 89.0 6496 11.0
Average amount of cigarette smoking per day
  < 1 cigarette 4982 73.5 1835 26.5 <  0.001
 1 cigarette 3393 76.4 1080 23.6
 2–5 cigarettes 18,417 85.2 3109 14.8
 6–9 cigarettes 16,077 91.3 1530 8.7
 10–19 cigarettes 11,958 94.1 794 5.9
  ≥ 20 cigarettes 5524 94.4 336 5.6
Quit attempts in the past year
 No 8258 88.1 1184 11.9 0.026
 Yes 22,815 87.1 3492 12.9
Current smokers among family members
 No 3856 74.2 1426 25.8 <  0.001
 Yes 7791 76.9 2440 23.1
Current smokers among close friends
 No 654 33.3 1371 66.7 <  0.001
 Yes 11,591 81.8 2652 18.2
Pocket money (won/week)b
  < 30,000 32,247 74.8 10,902 25.2 <  0.001
 30,000-59,999 18,589 83.8 3671 16.2
 60,000-89,999 4921 87.5 754 12.5
 90,000-119,999 3264 88.0 475 12.0
 120,000-149,999 903 89.6 100 10.4
  ≥ 150,000 5187 87.5 740 12.5
  1. KYRBWS: Korean Youth Risk Behavior Web-Based Survey
  2. aP-values were calculated by Chi-squared test
  3. bCurrency 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