condition mean min max ZT0-3 55.444966 55.444966 55.444966 ZT4-7 24.690822 24.690822 24.690822 ZT8-11 12.338904 12.338904 12.338904 ZT12-15 14.740012499999999 14.740012499999999 14.740012499999999 ZT16-19 8.8796655 8.8796655 8.8796655 ZT20-23 9.563615500000001 9.563615500000001 9.563615500000001