What Is Analysis of Covariance (ANCOVA) and How to Correctly Report Its Results in Medical Research?

1. Department of Occupational Health Engineering, School of Health, Zabol University of Medical Sciences, Zabol, Iran 2. Razi Herbal Medicines Research Center, Lorestan University of Medical Sciences, Khoramabad, Iran 3. Noncommunicable Diseases Research Center, Fasa University of Medical Sciences, Fasa, Iran 4. Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran