The regression results show that the increase of HHI index which represents the market concentration has notable effect to profit performance and safety performance.

• 结果表明,以HHI指数表示的市场集中度的提高对利润绩效和安全绩效的改善有着显著的影响;而国有所有权集中度则对利润绩效和安全绩效无显著影响。