Table 3.

Recurrence rate of herpes zoster by age group and sex

Group	HZ cases	Follow-up person-years	Recurrent episodes	Recurrence rate (per 1,000 PY)	95% CI
Age group
0–9	398	1,340	1	0.75	0.02–4.16
10–19	1926	5,774	2	0.35	0.04–1.25
20–29	8093	21,090	39	1.85	1.31–2.53
30–39	18,096	42,440	164	3.86	3.30–4.50
40–49	22,086	51,030	264	5.17	4.57–5.84
50–59	37,720	82,878	330	3.98	3.56–4.44
60–69	42,664	93,824	330	3.52	3.15–3.92
70–79	25,644	53,595	280	5.22	4.63–5.87
≥ 80	10,242	22,568	186	8.24	7.10–9.52
Sex
Male	79,289	177,513	755	4.27	3.98–4.57
Female	87,580	197,025	841	4.25	3.96–4.57
Total	166,869	374,538	1,596	4.26	4.05–4.48