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. Author manuscript; available in PMC: 2016 Nov 19.

Published in final edited form as: J Water Health. 2016 Oct;14(5):864–877. doi: 10.2166/wh.2016.012

Table 5. Sensitivity analyses: GEE regression sets for combined exposures.

Outcomes: Diabetes incidence and prevalence

	M=1 (exposure in mg)		M=2 (exposure in ppm)

Covariates	Incidence E=1	Prevalence E=2	Incidence E=1	Prevalence E=2
Added fluoride	0.26 (0.08)^**	0.22 (0.06)^**	−1.68 (0.54)^**	−1.09 (0.37)^**
Natural fluoride	−0.45 (0.15)^**	−0.32 (0.06)^**	−3.12 (0.59)^***	−2.30 (0.42)^***
AA physical inactivity	0.04 (0.01)^***	0.06 (0.01)^***	0.03 (0.01)^*	0.05 (0.01)^***
AA obesity	0.32 (0.02)^***	0.23 (0.01)^***	0.33 (0.02)^***	0.23 (0.01)^***
Poverty percent	0.13 (0.01)^***	0.10 (0.01)^***	0.12 (0.01)^***	0.09 (0.01)^***
Fluoridation chemical (yes/no)
Sodium fluoride	0.02 (0.09)	0.06 (0.07)	0.16 (0.10)	0.15 (0.07)^*
Fluorosilicic acid	−0.46 (0.12)^***	−0.35 (0.09)^***	−0.32 (0.12)^**	−0.26 (0.09)^***
Sodium fluorosilicate	−0.002 (0.12)	−0.08 (0.09)	0.05 (0.11)	−0.04 (0.09)
Years water system fluoridated	−0.007 (0.003)^*	−0.004 (0.002)	−0.003 (0.003)	−0.002 (0.002)
Population per square mile (log)	0.91 (0.09)^***	0.61 (0.06)^***	0.76 (0.09)^***	0.51 (0.07)^***
Year=2010	−1.85 (0.08)^***	0.36 (0.06)^***	−1.88 (0.08)^***	0.34 (0.06)^***
Number of counties	759	759	759	759
Number of observations	1,518	1,518	1,518	1,518

Robust standard errors in parentheses.

^***

P < 0.001,

^**

P < 0.01,

^*

P < 0.05.