Table 1

Characteristics of studies included in the systematic review and meta-analysis

Author and year	Country	Time of sampling	Mean age (years)	Sample size	Patients with NTM	Study design	Method of detection	NTM (%)
McShane et al 201252	USA	2009–2011	≥18	106	9	RS	Sputum culture	8.5
Xu et al 201453	China	2009–2012	47.4	3857	431	RS	Sputum culture	11.2
Guan et al 201554	China	2012–2013	44.6	144	5	PS	Sputum culture	3.5
Kadowaki et al 201555	Japan	2008–2012	73	147	26	RS	Sputum culture	17.7
Izhakian et al 201656	Israel	2006–2014	64	339	29	RS	Bronchoalveolar/lavage cultures	8.6
Faverio et al 201647	Italy	2006–2014	65	162	32	PS	Bronchoalveolar/sputum culture	19.8
Buscot et al 201657	France	2002–2012	61.0	196	7	RS	Sputum/bronchoalveolar lavage culture	3.6
Dimakou et al 201658	Greece	2009–2014	60.5	205	2	PS	Sputum culture	1.0
Sin et al 201919	Korea	2005–2016	59.6	6957	1740	RS	Sputum culture	25
Pieters et al 201959	Netherland	2012–2016	60	120	6	RS	Sputum culture	5.0
Huang et al 202060	China	2002–2016	65.5	8385	304	RS	Sputum culture	3.6
Darwish et al 202061	Egypt;	2017–2018	55.2	40	3	PS	Sputum PCR	7.5
Sharif et al 202062	Pakistan	2017–2019	NA	196	2	PS	Sputum culture	1.0
Yin et al 202163	China	2018–2020	62	202	47	RS	Sputum/BAL culture	23.3

AFB, acid fast bacillus smear; BAL, bronchoalveolar lavage; MBC, mycobacteria culture; NA, not available; NTM, non-tuberculous mycobacteria; PS, prospective study; RS, retrospective study.