with decreasing size of the areas considered (table 3). In
geoadditive models, the risk of substance-related disorders
was 1.97 times higher (95 percent confidence interval: 1.39,
2.79) in the highest versus the lowest quartiles of contextual
deprivation when the contextual factor was measured in
administrative neighborhoods, but it was 4.12 times higher
(95 percent confidence interval: 3.01, 5.64) when the
100 nearest inhabitants aged 25 years or older were considered.
The raw data showed that 38 percent of those with
a substance-related disorder (362 of 956 cases) resided in
the highest quartile of contextual deprivation when the contextual
factor was defined in administrative neighborhoods,
whereas 51 percent of the cases (n ¼ 485) were in the highest
quartile when the factor was defined in local areas comprising
the 100 nearest inhabitants.