Table 4. Risk of skeletal fluorosis associated with GSTP1 Rs1695 in subjects overall and stratified by ethnicity.

	Case (n)	Control (n)	crude OR (95% CI)	adjusted OR (95% CI)*
All subjects
AA	226	681	1.0 (ref)	1.0 (ref)
AG+GG	121	386	0.945 (0.733, 1.217)	0.907 (0.693,1.066)
Tibetan
AA	91	117	1.0 (ref)	1.0 (ref)
AG+GG	32	68	0.605 (0.366, 0.999)	0.558 (0.326,0.955)
Kazakh
AA	52	106	1.0 (ref)	1.0 (ref)
AG+GG	46	86	1.090 (0.669, 1.776)	1.082 (0.659,1.776)
Mongolian
AA	36	137	1.0 (ref)	1.0 (ref)
AG+GG	22	66	1.269 (0.692, 2.326)	1.225 (0.657,2.283)
Han
AA	39	255	1.0 (ref)	1.0 (ref)
AG+GG	18	113	1.042 (0.571, 1.899)	1.116 (0.605,2.057)
Russians
AA	8	66	1.0 (ref)	1.0 (ref)
AG+GG	3	53	0.467 (0.118,1.847)	0.446 (0.108,1.843)

* Adjusted for age, sex, ethnicity, and fluoride exposure.