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Table 1 Demographic characteristics of participants

From: Gender differences in the association between self-reported stress and cigarette smoking in Korean adolescents

Characteristics Total (%) Girls (%) Boys (%) p
Age (years)     0.808
 12 697 (17.7) 317 (17.0) 380 (18.4)  
 13 654 (16.6) 312 (16.7) 342 (16.6)  
 14 658 (16.7) 313 (16.8) 345 (16.7)  
 15 524 (13.3) 247 (13.2) 277 (13.4)  
 16 507 (12.9) 251 (13.5) 256 (12.4)  
 17 482 (12.3) 238 (12.8) 244 (11.8)  
 18 408 (10.4) 188 (10.1) 220 (10.7)  
Average household income (US$/month)    0.748
  < 1500 902 (23.0) 439 (23.5) 463 (22.4)  
 1500–2499 1053 (26.8) 506 (27.1) 547 (26.5)  
 2500–3500 771 (19.6) 359 (19.2) 412 (20.0)  
  > 3500 1204 (30.6) 562 (30.1) 642 (31.1)  
Place of residence     0.953
 Urban 3263 (83.0) 1550 (83.1) 1713 (83.0)  
 Rural 667 (17.0) 316 (16.9) 351 (17.0)  
Cigarette smoking     <0.001
 Yes 308 (7.8) 73 (3.9) 235 (11.4)  
 No 3622 (92.2) 1793 (96.1) 1829 (88.6)  
Stress     <0.001
 Very high 158 (4.0) 89 (4.8) 69 (3.3)  
 High 911 (23.2) 480 (25.7) 431 (20.9)  
 Medium 2250 (57.3) 1043 (55.9) 1207 (58.5)  
 Low 611 (15.6) 254 (13.6) 357 (17.3)