Change of urinary fluoride and bone metabolism indicators in the endemic fluorosis areas of southern china after supplying low fluoride public water

Table 2 Urinary fluoride levels after change of water supply, Guangdong, China, 1992 to 2009

Village	Years of using public water	# of samples	UF(mg/l) ^*
A	6	128	0.62 ± 0.38^#
B	14	108	0.51 ± 0.42
C	15	73	0.36 ± 0.12^#
D	17	114	0.27 ± 0.28^#
E	Control	127	0.48 ± 0.29
Total	-	529	0.44±0.35
Median^*			0.43±0.38

*: In Shapiro-wilk test, urinary fluoride levels were not normally distributed (P<0.05). Kruskal-Wallis test shows five Villages were statistically significant: χ²=127.92, P=0.00.
^#: Dunnett t-test method after rank transform for the pairwise comparisons, the difference was statistically significant (P<0.05).
*: Pooled Median from group A through D; P values of Kolmogorov-Smirnov Z test for median difference between pooled median and control median; Z=1.63, P =0.01.

ISSN: 1471-2458