condition mean min max ZT0-3 1.33452175 1.2923235 1.37672 ZT4-7 2.16463 2.16463 2.16463 ZT8-11 1.171256 1.171256 1.171256 ZT12-15 0 0 0 ZT16-19 1.1208555 1.1208555 1.1208555 ZT20-23 1.8606699999999998 1.8606699999999998 1.8606699999999998