Table 1 Characteristics of included studies
Author | Country (ethnicity) | Cases/controls | Diagnosis of cases | Selection of controls |
|---|---|---|---|---|
Selvaraj | India (Asian) | 210/120 | Smear, culture, radiological, clinical response confirmed PTB | Normal healthy spouses and Tuberculosis Research Centre staff, ethnicity and area of residence matched |
Fitness | Malawi (African) | 181/533 | Smear, culture, histology confirmed TB, HIV negative | No history or symptom of TB; not first or second degree relatives of the cases; age, sex and area of residence matched |
Vejbaesya | Thailand (Asian) | 149/147 | Smear, culture, clinical and radiological response confirmed PTB, HIV negative | Unrelated healthy blood bank donors |
Ates | Turkey (Caucasian) | 128/80 | Smear, culture, pathological, radiological , clinical response confirmed PTB,EPTB | No history of TB noted on chest radiography, age and sex matched |
Trajkov | Republic of Macedonia (Caucasian) | 75/301 | Smear/culture confirmed PTB | No family history of TB, nationality and area of residence matched |
Merza | Iran (Asian) | 117/60 | Smear and radiological confirmed PTB | Nurses, doctors and TB staff with no laboratory or clinical sign of diseases development, age, sex and nationality matched |
Sharma | India (Asian) | 185/155 | Smear, culture, histology, radiological , clinical response confirmed PTB,EPTB,HIV negative without chronic illness | Without a family history of TB or any other related disease and a possibility of a latent tuberculosis infection, socioeconomic status and ethnicity matched |
Anoosheh | Iran (Asian) | 93/103 | Smear and culture confirmed PTB | No history of TB |
Lin | China (Asian) | 46/40 | Pathological examination and clinical response confirmed EPTB | NR |