condition mean min max ZT0-3 7802.465653 7802.465653 7802.465653 ZT4-7 8390.8924705 8390.8924705 8390.8924705 ZT8-11 7801.3353735 7801.3353735 7801.3353735 ZT12-15 8161.5173595 8161.5173595 8161.5173595 ZT16-19 7917.005781 7917.005781 7917.005781 ZT20-23 5487.051336500001 5487.051336500001 5487.051336500001