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Table 1 Main characteristics of the population

From: Socioeconomic status and exposure to disinfection by-products in drinking water in Spain

   n %
Gender Male 1105 87%
  Female 166 13%
Age; mean (sd)   65 (10)
Region Barcelona 247 19%
  Vallès/Bages 190 15%
  Alicante 84 7%
  Tenerife 226 18%
  Asturias 524 41%
Smoking status Never smokers 367 29%
  Occasional smokers 97 8%
  Former smokers 510 40%
  Current smokers 291 23%
Education Illiterate 368 30%
  Primary school incomplete 224 18%
  Primary school complete 443 36%
  High school/higher education 212 17%
Income per person Low, <300 euros/month 308 32%
  Medium, 300-600 euros/month 464 47%
  High, >600 euros/month 176 19%
  1. Note: some of the variables have missing values: smoking status (n = 6), education (n = 24), income per person (n = 323).