Table 1. Main characteristics of all the 19 studies summarized for the present meta-analysis.
| First authors and Refs. | Year | Country of origin | Study design | Ethnicity | Cases | Controls | Selection of controls | Source of genotyping |
|---|---|---|---|---|---|---|---|---|
| Salimi et al. [16] | 2015 | Iran | HB | Asian | 120 | 131 | No clinical symptoms and history of PTB, chest X-ray, C-reactive protein (CRP) was measured | PCR-RFLP |
| Joshi et al. [17] | 2014 | India | HB | Asian | 110 | 115 | PCR-RFLP | |
| Sinaga et al. [18] | 2014 | Indonesia | HB | Asian | 76 | 76 | Chest X-ray, no history of TB, tuberculin test | PCR-RFLP |
| Rathored et al. [19] | 2012 | India | HB | Asian | 338 | 205 | No clinical history of TB, chest X-ray, peripheral blood count, liver and kidney function | PCR-RFLP |
| Singh et al. [20] | 2011 | India | HB | Asian | 101 | 225 | No clinical symptoms and history of TB, normal CXR findings and PPD skin test results <5 mm | PCR-RFLP |
| Kang et al. [21] | 2011 | Korea | HB | Asian | 150 | 83 | No clinical history of TB | PCR-RFLP |
| Sharma et al. [22] | 2011 | India | HB, PB | Asian | 261 | 1053 | No clinical history of TB | PCR-RFLP |
| Banoei et al. [23] | 2010 | Iran | HB | Asian | 60 | 62 | No clinical history of TB | PCR-RFLP |
| Marashian et al. [24] | 2010 | Iran | HB | Asian | 164 | 50 | Chest X-ray, three serial sputum smear tests | PCR-RFLP |
| Alagarasu et al. [25] | 2009 | India | HB | Asian | 105 | 146 | No clinical history of TB | PCR-RFLP |
| Selvaraj et al. [26] | 2009 | India | HB | Asian | 65 | 60 | No clinical history of TB | PCR-RFLP |
| Vidyarani et al. [27] | 2009 | India | HB | Asian | 40 | 49 | No clinical history of TB | PCR-RFLP |
| Merza et al. [28] | 2009 | Iran | HB | Asian | 117 | 60 | No clinical history of TB, PPD skin test | PCR-RFLP |
| Selvaraj et al. [29] | 2008 | India | HB | Asian | 51 | 60 | No clinical history of TB | PCR-RFLP |
| Olesen et al. [30] | 2007 | West Africa | HB | African | 320 | 345 | No clinical history of TB | TaqMan |
| Bornman et al. [31] | 2004 | West Africa | PB | African | 343 | 634 | No clinical history of TB | PCR-RFLP |
| Selvaraj et al. [32] | 2004 | India | HB | Asian | 46 | 64 | No clinical history of TB | PCR-RFLP |
| Selvaraj et al. [33] | 2003 | India | HB | Asian | 120 | 80 | No clinical history of TB | PCR-RFLP |
| Fibla et al. [34] | 2002 | Spain | PB | European | 48 | 146 | No clinical history of TB, negative test of TB | Not mentioned |
Abbreviations: HB, hospital based; PB, population based.