condition mean min max ZT0-3 7.33306 6.011515 8.654605 ZT4-7 5.703475 5.703475 5.703475 ZT8-11 3.447555 3.447555 3.447555 ZT12-15 0 0 0 ZT16-19 7.059945 7.059945 7.059945 ZT20-23 6.507770000000001 6.507770000000001 6.507770000000001