Fig. 2
Boxplot showing distribution of Pb levels (μg/dL) stratified by Governorates (A), Governorates and sex (B), Governorates and age categories (C). Boxes show Pb distribution as median and interquartile range. Extremes values are shown above each box. For presentation, the maximum at Y-axis was set at 30 μg/dL. A total of 16 cases had blood Pb levels > 30 μg/dL. These are distributed as follows: Male; 1 in Hawally, 1 in Mubarak Al-Kabeer and 3 in Al-Ahmadi. Female; 1 in Al-Asima, 1 in Farwaniya, 1 in Al-Ahmadi and 8 in Mubarak Al-Kabeer. Statistics: A; Median test p < 0.001; B; Governorate, χ2 = 65.5, p < 0.001; sex, χ2 = 15.3, p < 0.001, Governorate*sex, χ2 = 94.5, p < 0.001; C; Governorate, χ2 = 149.2, p < 0.001; age, χ2 = 15.6, p < 0.001, Governorate*age, χ2 = 49.6, p < 0.001. Horizontal line represents the overall median. BLL: Blood Pb level