Table 3.

Incidence (per 100,000 per year) of operated cases of chronic subdural haematoma referred from Bedfordshire, Cambridgeshire, Norfolk, and Suffolk (2015–2018) n = 446 (95% CI 95% confidence interval, population at risk defined using Office for National statistics 2016 population projection for these counties. Confidence intervals are Poisson exact)

Age group	N	Incidence (/100,000/year)	95% CI
0–9	0	0.00	0.00–0.24
10–19	0	0.00	0.00–0.24
20–29	3	0.20	0.04–0.57
30–39	4	0.25	0.07–0.65
40–49	14	0.83	0.46–1.40
50–59	30	1.77	1.20–2.53
60–69	65	4.32	3.33–5.51
70–79	163	15.08	12.85–17.58
80–89	147	25.71	21.72–30.21
90 +	20	15.49	9.46–23.92