The effect of age on the incidence of COVID-19 complications: a systematic review and meta-analysis

Table 1 Characteristics of the included studies for this review among COVID-19 patients

S. no	First author	Publication year	Country	Sample size	Mean age	Quality score^a
1	Jin et al. [20]	2020	China	651	51	18
2	Chen et al. [21]	2020	China	99	55.5	19
3	Yang et al. [22]	2020	China	52	59.7	15
4	Zhang et al. [23]	2020	China	221	55	19
5	Cao et al. [24]	2020	China	102	54	19
6	Huang et al. [17]	2020	China	41	49	19
7	Du et al. [25]	2020	China	85	66	14
8	Wang et al. [26]	2020	China	138	56	18
9	Zhao et al. [27]	2020	China	77	52	17
10	Guan et al. [18]	2020	China	1099	47	19
11	Chen et al. [28]	2020	China	274	68	19
12	Deng et al. [19]	2019	China	225	69	17

ISSN: 2046-4053