Table 1 The prevalence of skeletal fluorosis and fluoride exposure between Tibetans and Kazaks.

From: Matrix Metallopeptidase-2 Gene rs2287074 Polymorphism is Associated with Brick Tea Skeletal Fluorosis in Tibetans and Kazaks, China

Viariable

All subjects

Tibetans

Kazaks

n (%)

n (%)

n (%)

n = 598

n = 308

n = 290

Fluoride intake (mg)

5.985(3.749, 10.102)

5.895(3.797, 9.495)

6.142(3.642, 10.759)

Urine fluoride (mg/L)

2.755(1.763, 4.138)

2.359(1.575, 3.628)

3.166(2.060, 4.576)*

Skeletal fluorosis

 cases

221(36.96%)

123(39.9%)

98(33.8%)

 controls

377(63.04%)

185(60.1%)

192(66.2%)

Skeletal fluorosis severity

 no

377(63.04%)

185(60.06%)

192(66.21%)

 mild

150(25.08%)

68(22.08%)

82(28.28%)

 moderate

43(7.19%)

32(10.39%)

11(3.79%)*

 severe

28(4.68%)

23(7.47%)

5(1.72%)*

  1. Note: Fluoride intake and urine fluoride were represented as median (P25, P75) and tested by Mann-Whitney U test. Z was 0.294 and 5.359, respectively; the comparison of skeletal fluorosis and skeletal fluorosis severity between the two ethnic groups were performed by Likehood Ratio test. Likehood Ratio was 2.415 and 24.145, respectively.*, compare with Tibetans, P < 0.05.
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