condition mean min max ZT0-3 0.8238125 0.4045485 1.2430765 ZT4-7 2.9399925 2.9399925 2.9399925 ZT8-11 0.8194 0.8194 0.8194 ZT12-15 0 0 0 ZT16-19 1.2233465 1.2233465 1.2233465 ZT20-23 0.822575 0.822575 0.822575