Table 3 Cumulative probability (%) of age of onset of Huntington's disease by CAG repeat size based on the 176 results with concordant DNA results from both reference centres.

Age (years)	36 (repeats)	37 (repeats)	38 (repeats)	39 (repeats)	36–38 (repeats)	36–39 (repeats)
65	66.3 (34.4 to 98.2)	56.4 (36.4 to 76.4)	83.5 (71.2 to 95.8)	56.9 (44.2 to 69.6)	70.1 (58.7 to 81.5)	63.9 (55.5 to 73.2)
70	66.3 (34.4 to 98.2)	56.5 (36.4 to 76.4)	88.2 (75.8 to 100)	59.8 (46.7 to 72.9)	74.1 (61.8 to 86.4)	67.1 (58.2 to 75.9)
75	66.3 (64.2 to 84.2)	78.2 (46.4 to 100)	96.1 (86.3 to 100)	63.8 (49.9 to 77.7)	87.0 (72.9 to 100)	74.2 (64.2 to 84.2)

Data in parentheses are 95% confidence intervals.