Isoniazid Dosage Prediction Model Development

* Eligible participants were patients newly diagnosed with active TB * Who underwent standard four drug treatment for 6months: isoniazid (5 mg/kg, usually 300 mg), rifampin (450 mg for \<50 kg or 600 mg for 50 kg body weight), ethambutol(15mg/kg), and pyrazinamide (20 - 30 mg/kg) * Given daily for two months and followed by isoniazid and rifampin with or without ethambutol for four months. * Those patients with abnormal hepatic function on laboratory testing (increased serum aspartate aminotransferase, alanine aminotransferase, or total bilirubin) before anti-TB treatment, underlying liver disease or systemic illness such as congestive heart failure, acute life-threatening disease, or alcoholism, or disease that was resistant to INH at the start of treatment were excluded.