Table 2.

Distribution of CAG repeats in the Huntingtin gene in normal individuals and HD patients in population of different geographical origins

Geographical origins	CAG repeats of normal population (mean ± SD)	CAG repeats of HD patients
Western countries (479 cases)[2]	18.4 ± 3.7	>36
The mainland of China[28]	16.4 ± 1.5	36–120
Taiwan of China (35 cases)[21,22]	17.75 ± 1.95	38–109
Japan (110 cases)[5,35]	16.6 ± 1.3	36–95
Thailand (18 cases)[24]	16.5 ± 1.9	39–48
Korea (36 cases)[4]	No data	40–58
India (28 cases)[23]	16.8 ± 2.1	41–56

HD: Huntington disease; CAG: Cytosine-adenine-guanine.