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. Author manuscript; available in PMC: 2021 Apr 8.
Published in final edited form as: Prev Med. 2017 Nov 16;111:291–298. doi: 10.1016/j.ypmed.2017.11.015

Table 1.

Proportion (%) of county-level variance in prevalence of untreated caries explained by regression models at individual, tract, county, and state levels among US children aged 6–9 years, NHANES 2005–2010.

Models County-level variance SE P-value % county-level variance explained
Null model 0.173 0.065 0.004
Model 1 with individual-level variablesa 0.160 0.062 0.005 7.2%
Model 2 with individual- and tract-level variablesb 0.133 0.056 0.009 23.2%
Model 3 with individual-, tract- and county-level variablesc 0.006 0.036 0.430 96.3%
Model 4 with individual-, tract-, county, and state-level variablesd < 0.001 < 0.001 > 0.50 > 99.9%

Abbreviations: NHANES, National Health and Nutrition Examination Survey; SE, standard error.

a

Model 1 included age, sex, race/ethnicity, and health insurance status at individual level.

b

Model 2 included tract-level poverty rate to Model 1.

c

Model 3 included poverty rate, dentist-population ratio, proportion of Hispanic children, proportion of population aged 25+ years with education level of high school graduate or higher, and rural-urban classification at county level to Model 2.

d

Model 4 included state-level proportion of children enrolled in Medicaid/CHIP receiving dental services in the past year to Model 3.