Table 1.

Characteristics of eligible studies.

			Diabetes mellitus			Non-diabetes mellitus
Author	Country	Year	Event number of herpes zoster	Person-years	Incidence (1000 person-years)	Event number of herpes zoster	Person-years	Incidence (1000 person-years)
Suaya et al (2014)	USA	2014	61,142	7,681,336	7.96	359,373	80,266,547	4.48
Esteban-Vasallo et al (2014)	Spain	2014	8012	854,158	9.38	58,772	13,541,935	4.34
Muñoz-Quiles et al (2017)	Spain	2017	14,104	1,516,559	9.3	55,334	8,137,353	6.8
Chen et al (2017)	Taiwan	2017	85	40,226	2.11	195	163,212	1.19
Lai et al (2019)	Taiwan	2019	1676	213,530	7.85	6057	897,807	6.75
Overall					7.22			4.12