3. Results
3.1. Population Characteristics
The study sample had an approximately equal proportion of males (49%) and females (51%). The mean age was 32 years old, 73% were white, and 50% of the sample reported a high school, trade school, or college degree, while the other 50% reported a university degree or higher. The mean household income was $87,700 (median = $73,000) and the mean BMI was 24. Most demographic variables, including sex, age, and highest household education, had less than
Background: Previous systematic reviews of epidemiology studies have found support for a geographical association between high levels of naturally occurring fluoride in water (>1.5 ppm) and lower IQ in children. Most of the evidence from humans is from fluoride-endemic regions having higher background levels of fluoride compared to the fluoride concentrations historically used in community water fluoridation programs (0.7–1.2 ppm). Confidence in this body of evidence is limited, prima
Funding information: National Natural Science Foundation of China, Grant/Award Number: 81660524; The First-Class Discipline Construction Project in Guizhou Province-Public Health and Preventive Medicine, Grant/Award Number: 2017[85]
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