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Table 4 Water quality test and most probable number test of water samples associated with water outage in Taiwan, 2004-2006

From: Water outage increases the risk of gastroenteritis and eyes and skin diseases

   Normal period Outage period 10-day lag period p value
   n (%) n (%) n (%)  
Water quality test (day) Yes 339 (22.2) 94 (25.8) 456 (22.1) 0.29
  No 1186 (77.8) 271 (74.2) 1606 (77.9)  
  Unqualified rate (%) 0.18 0.69 0.66 0.31
MPN test (day) Yes 168 (11.0) 45 (12.3) 195 (9.46) 0.13
  No 1357 (89.0) 320 (87.7) 1867 (90.5)  
  Unqualified rate (%) 0.03 0 0 0.38
  mean ± sd. 2.84 (9.84) 2.16 (5.08) 2.54 (8.82) 0.47
  1. MPN: most probable number of coliform test result.