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Table 2 Percentages of drinking water type consumed at home, use of pools and duration of bath/shower by educational level

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

  Illiterate Primary school incomplete Primary school complete High school or higher education p-value TOTAL
  n % n % n % n %   n %
Source of drinking water, currently
   Tap water 243 69% 131 61% 265 62% 116 57%   755 63%
   Bottled 59 17% 54 25% 99 23% 67 33%   160 23%
   Springs and wells 48 14% 29 14% 61 14% 22 11% 0.003 279 14%
Current average residential THM level (μg/l)
   Low (<= 48 μg/l) 103 48% 69 46% 155 54% 59 38%   386 48%
   High (>48 μg/l) 111 52% 80 54% 133 46% 97 62% 0.014 421 52%
Source of drinking water at the longest residence
   Tap water 227 63% 126 57% 258 58% 136 64%   747 61%
   Bottled 39 11% 40 18% 67 16% 44 21%   190 15%
   Springs and wells 96 26% 54 25% 116 26% 32 15% 0.002 298 24%
Lifetime average residential THM level, from age 15 (μg/l)
   Low (<= 26 μg/l) 132 59% 62 47% 155 54% 59 39%   408 51%
   High (<26 μg/l) 93 41% 71 53% 133 46% 91 61% 0.002 388 49%
Ever swimming pool attendance
   No 259 93% 162 89% 307 88% 134 74%   862 87%
   Yes 21 7% 21 11% 41 12% 46 26% <0.001 129 13%
Showers/baths
   Short (<= 7 min/day) 150 60% 87 52% 179 55% 77 44%   493 54%
   Long (>7 ming/day) 99 40% 81 48% 149 45% 98 56% 0.010 427 46%
  1. Note: the sum of the columns for the different variables may not be equal due to missing values