therefore further analyses were undertaken using indexes of inequalities which overcome at least in part the problems just described disparities in drinking patterns related to education level and the socioeconomic status are assessed and gauged using the concentration index cl this study uses the corrected cl proposed by wagstaff in order to take into account the bounded nature of the health outcome eg probability of being alcohol consumer the cl is bounded between and with the sign indicating the direction of inequality a positive index indicates that the welloff are less likely to be alcohol consumers or hazardous or heavy episodic drinkers a zero value indicates no inequality and a negative index indicates that the welloff are more likely to be alcohol consumers or hazardous or heavy episodic drinkers