After adjusting for provisions and reversals of loss reserves and ordinary policy liability reserves, the EI loss ratio is an indicator of the loss ratio on a current-period-occurrence basis. It is calculated as follows. → Net Loss Ratio
• EI loss ratio = claims incurred ÷ premiums earned
• Claims incurred = period-end net claims paid + (period -
　　　　　　　　　 end loss reserve – previous period-end loss reserve)
• Premiums earned = previous period-end unearned premiums
 　                            + net premiums written for the period
　　　　　　　　　 – period-end unearned premiums