| 21 | Pandit N S K (2006) [70] | India | 274 | 6.2 | Cross sectional study | All the patients who registered for DOT treatment during last quarter (Oct-Nov-Dec) 2002, in Anand district, state Gujarat, India | |
| 22 | Daniel O J (2006) [64] | Nigeria | 774 | 23 | Retrospective cohort study | Adult Tuberculosis patients age 15 years and above registered for anti-TB treatment DOTS between January 1997-December 2003 , Sagamu, Nigeria | |
| 23 | Estifanos B S (2007) [32] | Ethiopia | 404 | 20 | Prospective cohort study | Smear-positive tuberculosis patients in Hossana Hospital | |
| 24 | Gelmanova I Y (2007) [43] | Russia | 237 | 8.8 | Retrospective cohort study | Detected, smear and/or culture-positive adult TB patients initiating therapy in a DOTS programme in Tomsk between 1 January and 31 December 2001 | |
| 25 | Fahrettin T (2008) [44] | Turkey | 586 | 5.1 | Retrospective cohort study | Adult pulmonary tuberculosis patient age more than 15 years in Istanbul Eyup tuberculosis Dispensary between year 1999-2004 | |
| 26 | Franke M F (2008) [50] | Peru | 671 | 10 | Retrospective cohort | Patients with multi drug resistant TB disease | |
| 27 | Kapella B K (2009) [71] | Thailand | 995 | 40 | Cohort study | Registered TB treatment (non Thai) from 1 October 2004 to 31 September 2006. | |
| 28 | Xu L (2010) [33] | China | 501 | 9 | A patient-based study survey | Rural smear-positive pulmonary TB patients registered with the county TB dispensaries at study sites who completed treatment during the period October 2006 to September 2007. | |
| 29 | Kliiman K (2010) [65] | Estonia | 1107 | 9.4 | A retrospective cohort study | patients with culture-confirmed pulmonary TB who started treatment during 2003-2005 | |
| 30 | Samuel A B (2010) [72] | Ghana | 165 | 55.7 | Cross-sectional study | TB patients who had registered in New Juaben District from January 2003 to December 2005 (TB Registry) and had fully completed their treatment during the time of the study | |
| 31 | Muture B N (2011) [45] | Kenya | 1978 | 16.7 | A Case-Control study | TB patients (adults and children) registered during the period January 2005 to March 2007 | |
| 32 | Kelly E D (2011) [51] | Morocco | 291 | 13 | A retrospective cohort study | Patients with smear- or culture-positive pulmonary tuberculosis | |
| 33 | Finlay A (2012) [46] | South Africa | 3165 | 12 | retrospective case control study | Adult persons ≥ 18 years old enrolled in treatment under DOTS at public health facilities in South Africa between January 1 and December 31, 2002 | |
| 34 | Culqui D R (2012) [56] | Peru | 789 | 5 | An unmatched- case-control study | Patients diagnosed with tuberculosis from 2004 to 2005 who completed treatment until September 2006 in Peru | |
| 35 | Garrido M D S (2012) [60] | Brazilia | 11,321 | 10 | Case control study | TB patients from 2005-2010 in the Amazonas State | |
| 36 | Tamhane A (2012) [75] | India | 150 | 29 | Cross-sectional study | Newly diagnosed sputum smear-positive pulmonary tuberculosis (TB) patients | |
| 37 | Nezenega Z S (2013) [61] | Ethiopia | 531 | 26 | Cross sectional study | TB patients on anti TB treatment in 11 public health centers and one hospital of Sidama zone | |
| 38 | Lalor M K (2013) [49] | Uzbekistan | 710 | 20 | A retrospective cohort | Multi and extensively drug-resistant tuberculosis patients who started treatment between 2003 and 2008 and thus had finished approximately 2 years of treatment by the end of 2010 | |
| 39 | Slama K (2013) [39] | Morocco | 320 | 33.8 | Case-control study | TB patients (new cases or relapsed) who were enrolled in treatment for TB between 1 January 2009 and 31 December 2010 | |