condition mean min max ZT0-3 1.6983350000000002 1.6983350000000002 1.6983350000000002 ZT4-7 1.4018549999999999 1.4018549999999999 1.4018549999999999 ZT8-11 0.400401 0.400401 0.400401 ZT12-15 0.293891 0.293891 0.293891 ZT16-19 0.777332 0.777332 0.777332 ZT20-23 0.922402 0.922402 0.922402