The results represented that there is a positive significant relationship between a firm size and a firm age with the level of CSRD. However, there is a negative significant association between financial leverage and profitability with the level of CSRD. Given that CSRD is different among various industries and the type of industry can be an influential factor in CSRD, an industry type’ variable in the fourth hypothesis is of a type of index variable and has eight levels, of which the first level is ranked as the base level. Our findings showed that the level of CSRD at industries of machinery and appliances, production of metal products, food and beverage products, and textiles is lower than the baseline level (pharmacy). Nevertheless, companies in the fifth industry (mineral products) have a higher level of CSRD in comparison with the pharmacy industry. Moreover, the authors find that there is a significant positive connection between audit fees and CSRD. This implies that Iranian managers in an inflationary economy probably manage earnings when they provide more CSRDs, which leads to increase in the audit risk and audit fees. | Empirical study on the effective factors of social responsibility disclosure of Iranian companies
