Table 3. Basic information of experimental subjects.

Sample ID1	Nationality	Age	Living in Tibet	BMI2
HH1	Han	23	51 months	22
HH2	Han	22	51 months	19.3
HH3	Han	22	51 months	18.1
HH4	Han	23	51 months	21.5
HH5	Han	24	51 months	17.6
HH6	Han	23	51 months	20.9
HH7	Han	25	51 months	21.2
HH8	Han	22	51 months	18.7
HH9	Han	24	72 months	24.3
HH10	Han	21	60 months	18.7
HH11	Han	23	51 months	19.7
HH12	Han	22	49 months	20.3
T1	Tibetan	22	Always	17.8
T2	Tibetan	21	Always	18.2
T3	Tibetan	20	Always	18.6
T4	Tibetan	21	Always	19.5
T5	Tibetan	18	Always	22.2
T6	Tibetan	25	Always	23.1
T7	Tibetan	20	Always	22
T8	Tibetan	20	Always	20.8
T9	Tibetan	20	Always	20.3
T10	Tibetan	21	Always	20.2
T11	Tibetan	20	Always	21.5
T12	Tibetan	20	Always	19.4
LH1	Han	20	Never	25.1
LH2	Han	19	Never	24.9
LH3	Han	21	Never	22.7
LH4	Han	20	Never	21.9
LH5	Han	20	Never	18.4
LH6	Han	19	Never	18.6
LH7	Han	19	Never	21.3
LH8	Han	20	Never	18.2
LH9	Han	22	Never	24.2
LH10	Han	22	Never	23.6
LH12	Han	25	Never	22.3

¹LH = Chinese Han living in Shaanxi; HH = Chinese Han living in Tibet; HH = Tibetans.

²BMI = body mass index.