Change in the geometric means of salivary cotinine concentrations (ng/mL) before (2004–05) and after (2011–12) the smoke-free legislation, Barcelona, Spain; results are stratified according to socio-demographic variables.

GM: Geometric mean. GSD: Geometric standard deviation. *Based on the adjusted geometric mean derived from a generalized linear model that included all the variables in the table. **The figures do not sum the total because of missing values.