Table 1 Overall complication rates per age group.

Age group (years)	Complication at surgery
	Yes	No	Total	Percentage (95% CI)
⩽50	1	28	29	3.45 (0.087 to 17.77)
50–60	5	74	79	6.33 (2.09 to 14.15)
60–70	18	269	287	6.27 (3.76 to 9.73)
70–80	37	510	547	6.76 (4.81 to 9.20)
80–90	28	417	445	6.29 (4.22 to 8.97)
>90	3	51	54	5.56 (1.16 to 15.39)
Total	92	1349	1441	6.38 (5.18 to 7.77)

CI, confidence interval