| 40 | Alobu I (2014) [35] | Nigeria | 1668 | 9.9 | A retrospective Cohort Study | Adult tuberculosis patients treated during 2011 and 2012 in tow large health facilities in Elbony state |
| 41 | Vasudevan K (2014) [59] | India | 564 | 5.9 | Retrospective cohort study | TB patients registered at RNTCP in Puducherry, Southern India. |
| 42 | Cherkaoui I (2014) [48] | Moroco | 277 | 3 | Case-control study | Adult patients with definite or probable pulmonary or extrapulmonary TB who either defaulted from TB treatment (cases) or successfully completed it (controls) were enrolled. |
| 43 | Abdelhadi A A (2015) [36] | Sudan | 306 | 11 | Case control study | Pulmonary TB patient |
| 44 | Lackey B (2015) [38] | Peru | 1233 | 10 | A Cohort Study | new adult smear-positive cases of pulmonary TB in a high-Incidence Area of Lima district |
| 45 | Roy N (2015) [55] | India | 158 | 15 | A case-control study | new sputum-positive (NSP) tuberculosis (TB) patients in Darjeeling District, West Bengal, India from August 2011 to December 2011 |
| 46 | Basa S (2015) [74] | India | 550 | 7.5 | Cross sectional study | TB patients registered under DOTS from January to June 2005 and to study the reasons for default in Mayurbhanj district, Orissa, India |
| 47 | Thelma E (2016) [37] | Philippines | 273 | 38 | Case-control study | More than 18 years of age with confirmed MDR or rifampin-resistant TB for whom treatment was initiated during July 1-December 31, 2012 |
| 48 | Saibannavar A (2016) [47] | India | 411 | 6 | A retrospective cohort study | TB defaulters patients |
| 49 | Ahmed A (2016) [57] | Sudan | 315 | 14 | Case control study | Tuberculosis patients registered at tuberculosis centers at all provinces in Khartoum state from May 2010 to May 2011 |
| 50 | Ahmed O A A (2016) [58] | Sudan | 315 | 14 | Case control study | Tuberculosis patients registered at tuberculosis centers at all provinces in Khartoum state from May 2010 to May 2011 |
| 51 | Kigozi G (2017) [34] | South Africa | 110,394 | 7.2 | A retrospective cohort study | Pulmonary TB cases older than 15 years of age with a recorded pre-treatment smear result registered in the ETR.Net electronic register |
| 52 | El-Muttalut M (2017) [40] | Sudan | 366 | 16.4 | A cross-sectional study | TB patient in Kassala State |
| 53 | Hashim E A (2017) [73] | Sudan | 160 | 21.3 | Case-control study | Pulmonary tuberculosis treatment Al-muglad rural hospital, Al-Muglad locality, West Kordofan state in Western Sudan |