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. 2021 Apr 6;129(4):047005. doi: 10.1289/EHP7404

Figure 1.

Figure 1 is a flowchart comprising four steps. Step 1: Swedish Mammography Cohort-Clinical leads to food frequency questionnaire and clinical examination from 2003 to 2009, where 8311 women were invited, 65 percent completed the food frequency questionnaire, and 61 percent participated in health examination. Step 2: This leads to an exclusion of following: 1) 570 women for missing urine for element analysis, which was first initiated in 2004; 2) 1 woman for missing urinary creatinine; and 3) 145 women for missing DEXA scans at either site, and then gets segregated into Urinary fluoride and Dietary fluoride. The segregation into Dietary fluoride is done after an exclusion of the following: 1) 194 women, who responded to a different food frequency questionnaire; 2) 12 women, who left incomplete food frequency questionnaire data; and 3) 28 women, who had implausible energy intake. Step 3: Urinary fluoride is further segregated into two categories, namely, Long-term residents, comprising 3478 women, after and exclusion of 828 women for not constantly drinking water fluoride from 1982 to baseline, and Main analyses, comprising 4306 women. Step 4: Dietary fluoride is further segregated into two categories, namely, Main analyses, comprising 4072 women and Long-term residents, comprising 3387 women, after and exclusion of 685 women for not constantly drinking water fluoride from 1982 to baseline.

Flow chart of eligible participants in the study. Note: DXA, dual energy X-ray absorptiometry; FFQ, food frequency questionnaire; SMC-C, Swedish Mammography Cohort–Clinical.