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Table 1 Socio-demographic characteristics of the participants by ‘Current asthma’ status

From: Prevalence of asthma in Portugal - The Portuguese National Asthma Survey

   Current asthma
  Total (n = 6 003) Yes (n = 450) No (n = 5 553)
Municipality    
  Urban 4593 (76.5) 337 (74.9) 4256 (76.6)
  Rural 1410 (23.5) 113 (25.1) 1297 (23.4)
Female, n (%) 3438 (57.3) 282 (62.7) 3156 (56.8)
Age groups, n (%)    
  <18 years old 716 (11.9) 56 (12.4) 660 (11.9)
  18-65 years old 3104 (51.7) 211 (46.9) 2893 (52.1)
  >65 years old 2178 (36.3) 183 (40.7) 1995 (36.0)
BMI , n(%)    
  Underweight (<18) 253 ( 5.1) 18 ( 4.9) 235 ( 5.1)
  Normal weight (18–25) 2179 (43.9) 140 (38.4) 2039 (44.3)
  Overweight (25–30) 1825 (36.7) 128 (35.1) 1697 (36.9)
  Obese (>30) 710 (14.3) 79 (21.6) 631 (13.7)
Education level , n(%)    
  <9 years 3907 (65.5) 312 (69.6) 3595 (65.1)
  9-12 years 1175 (19.7) 85 (19.0) 1090 (19.7)
  >12 years 732 (12.3) 40 (8.9) 692 (12.5)
SES †† , n(%)    
  Low 1289 (22.0) 111 (25.2) 1169 (21.7)
  Medium 4137 (71.1) 1169 (21.7) 3831 (71.2)
  High 405 ( 7.0) 23 ( 5.2) 382 ( 7.1)
Smoking status, n(%)    
  Non-smoker 4291 (71.5) 333 (74.0) 3958 (71.3)
  Ex-smoker 971 (16.2) 71 (15.8) 900 (16.2)
  Current smoker 741 (12.3) 46 (10.2) 695 (12.5)
Unit Packs-year, n(%)    
  ≤10 Packs-year 4799 (79.9) 368 (82.3) 4431 (80.5)
  >10 Packs-year 1150 (19.2) 79 (17.7) 1071 (19.5)
ETS ‡‡ , n(%)    
  No 4843 (80.7) 347 (77.1) 4496 (81.0)
  Yes 1160 (19.3) 103 (22.9) 1057 (19.0)
  1. †Body Mass Index. A total of 153 (2.5%) children were pre-schoolers (not shown). ††Socioeconomic Status was categorized in high (A social class), medium (B and C social classes) and low (D social class) based on occupation and school education of the person who contributes more for the household income. ‡‡Environmental Tobacco Smoke.