Table 5

Associations of well-water consumption at childhood and adulthood residences with PD.

% Exposed*







Cases, n = 319
 Controls, n = 296
 p for trend (GEE model 1)**
 OR and 95% CI (GEE model 2)**
History of well water use



     Ever
 61.8
 59.1
1.08
 0.77–1.50
     Never
 37.6
 39.9
1.00
 Referent
Duration (years)
0.52

     >22
 23.5
 20.3
1.17
 0.74–1.86
     10.5–22
 20.1
 19.3
1.10
 0.71–1.71
     <10.5
 18.2
 18.9
1.02
 0.64–1.61
     Never
 37.6
 39.9
1.00
 Referent

*Column totals may not sum to 100 due to rounding or missing data.

**GEE model adjusted for AAE, sex, cigarette smoking, and caffeine consumption.

Hancock et al. BMC Neurology 2008 8:6   doi:10.1186/1471-2377-8-6