Table 5.

Beta coefficients and $R^2$ for linear regression models predicting log-transformed MUF (unadjusted) levels by water fluoride levels before and after controlling for covariates. Model 3 includes creatinine level at each trimester (i.e., ${\text{MUF}}_{\text{CRE}\_\text{cov}}$) and Model 4 includes specific gravity level (${\text{MUF}}_{\text{SG}\_\text{cov}}$) at each trimester.

Covariates	Log ${\text{MUF}}_{\_\text{trimester}1}$ ($n=\mathrm{1,317}$)			Log ${\text{MUF}}_{\_\text{trimester}2}$ ($n=\mathrm{1,251}$)			Log ${\text{MUF}}_{\_\text{trimester}3}$ ($n=\mathrm{1,203}$)
	$R^2$	$\mathrm{B}\text{coefficient}$	95% CI	$R^2$	$\mathrm{B}\text{coefficient}$	95% CI	$R^2$	$\mathrm{B}\text{coefficient}$	95% CI
Unadjusted WTP fluoride level	0.17	0.75	0.66, 0.84	0.23	0.70	0.63, 0.77	0.13	0.47	0.40, 0.54
Model 3: After covariate adjustment	0.33			0.45			0.48
Creatinine	0.21	0.04	0.04, 0.04	0.25	0.04	0.04, 0.04	0.29	0.04	0.04, 0.05
WTP fluoride level	0.10	0.58	0.50, 0.66	0.16	0.59	0.53, 0.65	0.16	0.50	0.44, 0.56
Prepregnancy BMI	0.00	$-0.00$	$-0.01$, 0.00	0.00	$-0.00$	$-0.01$, 0.00	0.00	$-0.00$	$-0.00$, 0.00
Maternal age at delivery	0.01	0.01	0.00, 0.01	0.01	0.01	0.00, 0.01	0.01	0.01	0.00, 0.08
Smoking during pregnancy	0.00	0.02	$-0.00$, 0.05	0.00	0.01	$-0.01$, 0.03	0.00	0.02	$-0.00$, 0.04
No. glasses of water	0.00	0.01	0.00, 0.02	0.00	0.01	0.00, 0.01	0.00	0.01	0.00, 0.01
No. cups of black tea	0.01	0.10	0.06, 0.14	0.03	0.11	0.08, 0.14	0.02	0.08	0.06, 0.11
No. cups of green tea	0.00	0.07	$-0.03$, 0.16	0.00	0.02	0.04, 0.04	0.00	$-0.02$	$-0.09$, 0.05
Model 4: After covariate adjustment	0.31			0.48			0.50
SG	0.21	29.35	26.58, 32.12	0.30	30.15	28.03, 32.30	0.32	29.00	26.83, 31.16
WTP fluoride level	0.09	0.57	0.49, 0.65	0.14	0.57	0.51, 0.62	0.13	0.47	0.42, 0.53
Prepregnancy BMI	0.00	0.00	$-0.01$, 0.00	0.00	0.00	$-0.00$, 0.00	0.00	0.00	$-0.00$, 0.00
Maternal age at delivery	0.00	0.00	0.00, 0.01	0.01	0.01	0.00, 0.01	0.01	0.01	0.00, 0.01
Smoking during pregnancy	0.00	0.02	$-0.00$, 0.05	0.00	0.01	$-0.01$, 0.03	0.00	0.02	0.00, 0.04
No. glasses of water	0.00	0.01	0.00, 0.02	0.00	0.01	0.00, 0.02	0.01	0.01	0.01, 0.02
No. black cups of tea	0.01	0.10	0.07, 0.14	0.03	0.11	0.09, 0.14	0.03	0.11	0.08, 0.13
No. cups of green tea	0.00	0.07	$-0.03$, 0.16	0.00	0.04	$-0.04$, 0.12	0.00	0.01	$-0.05$, 0.08

Note: BMI, body mass index; CI, confidence interval; COV, covariance; CRE, creatinine; MUF, maternal urinary fluoride; SG, specific gravity; WTP, water treatment plant.

^*$p<0.01$_.