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Table 4 Test for Trend using the Mean of the Two Water Samples

From: A prospective study of rural drinking water quality and acute gastrointestinal illness

Indicator No AGII Odds Ratio (95% CI)* Test For
  AGII    Trend*
E. coli     
0 522 46 1.00  
0.1–1.5 27 2 0.85 (0.10–7.19)  
1.6–700 18 3 2.69 (0.34–21.56) P = 0.45
Total Coliform     
0 366 32 1.00  
0.1–2.5 103 16 2.00 (0.70–5.46)  
2.6–7750 98 3 0.33 (0.07–1.52) P = 0.47
  1. *Adjusted for age and number of years at current residence. AGII is acute gastrointestinal illness for specific defination, see methods