Fig 1.

Comparison of overall microbial contamination between water samples with no stagnation, overnight stagnation, or 2-month stagnation. Data shown are heterotrophic plate counts (HPC) measured in colony forming units (CFUs). The horizontal line in each box represents the median; the black dot represents the mean; the upper and lower boundaries of each box indicate the 75th and 25th percentiles, respectively; the whiskers designate the statistical maximum and minimum; and the open circles represent outliers. Statistical significance is indicated by P values based on Student's t test.