Kazan medical journalKazan medical journal0368-48142587-9359Eco-Vector5989910.17816/kazmj59899Research ArticleMorbidity with temporary disability of workers in ortho-toluidine productionKhlebnikovaM. I.info@eco-vector.com1503197152283853101202131012021Copyright © 2021, Khlebnikova M.I.2021<p>We studied the morbidity of workers in the production of ortho-toluidine for the years 1965-1967. The control group consisted of workers employed in auxiliary workshops of the same plant and not exposed to toxic substances. To exclude the influence of sex and age on the morbidity of the compared groups, homogeneous age and sex groups were selected. The morbidity indicators were statistically processed (not separately for each year, but for 3 years as a whole).</p>Kazan Medical archiveКазанский медицинский архив