Fig. 1

Time trend of prevalence of smoking between 2001 and 2013 by gender and age groups. Note 1: Smoking was defined as having smoked 100 cigarettes or more and having smoked every day or occasionally during the past month. Note 2: Comparisons between surveys were adjusted using SUDAAN. Note 3: (+) indicates a statistically significant difference in the prevalence of smoking in the particular age group between the 4 surveys, § indicates a statistically significant difference between. 2001 and 2005, * indicates a statistically significant difference between 2005 and 2009, #indicates a statistically significant difference between 2009 and 2013, $indicates a statistically significant difference between 2005 and 2013