condition mean min max ZT0-3 0.07497183333333333 0.0 0.2249155 ZT4-7 0.228531 0.228531 0.228531 ZT8-11 2.552415 2.552415 2.552415 ZT12-15 4.6421325 4.077825 5.20644 ZT16-19 2.18626 2.18626 2.18626 ZT20-23 0.0 0.0 0.0