Table 1

Characteristics of the study population, ITC Korea Survey

2005 (W1)
(n=995)
2008 (W2)
(n=1737)
2010 (W3)
(n=1560)
Age (years), n (%)
 18–2474 (7.4)129 (7.4)81 (5.2)
 25–39313 (31.5)485 (27.9)353 (22.6)
 40–54347 (34.9)596 (34.3)503 (32.2)
 55+261 (26.2)527 (30.4)623 (40.0)
Gender, n (%)
 Male954 (95.9)1668 (96.0)1484 (95.1)
 Female41 (4.1)69 (4.0)76 (4.9)
Marital status, n (%)
 Married722 (72.8)1234 (71.3)1121 (71.9)
 Never married200 (20.2)394 (22.8)316 (20.3)
 Others70 (7.0)102 (5.9)122 (7.8)
Educational attainment, n (%)
 Middle school or less209 (21.2)319 (18.9)324 (21.3)
 High school420 (42.7)773 (45.8)679 (44.5)
 College or more356 (36.1)595 (35.3)522 (34.2)
Household equivalent income,* n (%)
 Low431 (47.3)696 (46.0)682 (51.0)
 Middle239 (26.2)362 (23.9)287 (21.4)
 High242 (26.5)456 (30.1)370 (27.6)
Cigarettes per day, n (%)
 1–10284 (28.5)550 (31.7)535 (34.4)
 11–20547 (55.0)924 (53.2)792 (51.0)
 21+164 (16.5)263 (15.1)227 (14.6)
Notice anti-smoking advertising or information, n (%)
 No525 (52.8)552 (32.0)613 (39.8)
 Yes470 (47.2)1173 (68.0)929 (60.2)
Wave of recruitment, n (%)
 Wave 1995 (100.0)360 (20.7)215 (13.8)
 Wave 21377 (79.3)621 (39.8)
 Wave 3724 (46.4)
  • *Low:<30 000 000 won; middle: 30 000 000–44 999 000 won; high: ≥45 000 000 won.