Fig. 4From: Trends in dental caries of deciduous teeth in Iran: a systematic analysis of the national and sub-national data from 1990 to 2017Comparison of sub-national age-standardized dmft in 1990 and 2017 by sex. *The dotted line indicates the cut off for gender disparity. Those provinces above the line had higher dmft, dt, mt, and ft among boys in 1990 and 2017Back to article page