Int. J. Environ. Res. Public Health 2011, 8 570 Figure 1. Map of the Sampled Regions and States. 3. Results and Discussion 3.1. Descriptive Summary of the Sample The demographic distribution of survey respondents was similar to that reported for the general adult population based on the 2000 US census data for the demographic factors of community size, age (adult population), and formal education level. The only factor not in line with 2,000 census data was gender. Here, male respondents were much more heavily represented compared to the general population as a whole (about two thirds of the respondents were male, see Table 1). Even though 50% of the mailed surveys were addressed to females, it was apparent that the male adult in the surveyed household was more likely to respond to the survey [20]. The summary of sample statistics is shown in Table 1 below. Variable Name Primary bottled water users Regular bottled water users Table 1. Summary Statistics. Description Do you primarily purchase bottled water for your drinking water? (N = 5,823) I often use bottled water for drinking purpose (N = 5,821) Responses 0 = no 1 = yes 0 = no 1 = yes Mean/% 86.6% 13.4% 54.6% 45.4% Std. Dev.