Table 3b.

Mean comparisons of urinary fluoride and fluoride concentration of tap water (Cycle 3) between those with and with low, normal and high TSH levels among the constrained fluoride urine subsample (weighted and bootstrapped)

	Cycle 3 of CHMS
	Mean urinary fluoride (μmol/L) for the constrained fluoride subsample* (n=~820)	Mean fluoride concentration of tap water (mg/L) for the constrained fluoride subsample* (n=~820)
Low TSH (<0.55 mIU/L)	40.01 (24.35 to 55.67)	0.34 (0.16 to 0.51)
Normal TSH (0.55 to 4.78 mIU/L)	33.92 (26.79 to 41.05)	0.35 (0.21 to 0.49)
High TSH (>4.78 mIU/L)	30.76 (17.89 to 43.63)	0.38 (0.19 to 0.57)

*For Cycle 3, the constrained fluoride urine subsample refers to respondents who: 1) attended a fluoridated data collection site, 2) reported using fluoride-containing dental products at home and, 3) reported ever receiving fluoride treatments at the dentist.

CHMS, Canadian Health Measures Survey; TSH, thyroid-stimulating hormone.