condition mean min max ZT0-3 7.708005 7.708005 7.708005 ZT4-7 5.327764999999999 5.327764999999999 5.327764999999999 ZT8-11 7.77546 7.77546 7.77546 ZT12-15 7.5069099999999995 7.5069099999999995 7.5069099999999995 ZT16-19 10.50827 10.50827 10.50827 ZT20-23 9.061795 9.061795 9.061795