Table 1.

Characteristics of the studies related to asymptomatic tuberculosis proportion in the elderly population

Study	Study year	Study design	Country	Area	Sample size	No. of Asymptomatic TB	No. of active TB	Screening strategy	Symptom
Zhang [23]	2013	Cross-sectional study	China	Shandong Province	93,094	65	82	Questionnaire survey, and CXR.	/
Hu [19]	2021	Cross-sectional study	China	Zhejiang Province	49,399	57	115	Questionnaire survey, physical examinations and CXR.	Cough, expectoration, hemoptysis, fever, fatigue.
Kim [21]	2017	Cross-sectional study	Korea	South Korean Province	12,402	13	16	CXR.	/
Chen [26]	2017	Cross-sectional study	China	Guizhou Province	1119	23	38	Questionnaire survey and CXR.	Cough, expectoration, hemoptysis or bloody sputum, fever, chest pain, night sweats, etc.
Zhao [25]	2010–2014	Cross-sectional study	China	Guangxi Province	10,325	73	80	Questionnaire survey, CXR, and sputum examination.	/
Zhang [24]	2016	Cross-sectional study	China	Shanxi Province	2053	9	27	Suspicious symptom screening and CXR.	Cough, expectoration, etc.
Jiang [20]	2019	Cross-sectional study	China	Chongqing Municipality	453	10	16	Suspicious symptom screening and CXR.	Cough, expectoration, etc.
Wang [22]	2020	Cross-sectional study	China	Zhejiang Province	186,096	100	174	CXR.	Cough, expectoration, production, fatigue, loss of appetite, reduced body weight, chest pain, hemoptysis, night sweating.
Chen [27]	2011–2012	Cross-sectional study	China	Zhejiang Province; Henan Province; Yunnan Province	9319	78	96	CXR, sputum smear and sputum culture.	/