condition mean min max ZT0-3 1.0921728333333334 0.2477195 1.6036190000000001 ZT4-7 0.216283 0.216283 0.216283 ZT8-11 0.908878 0.908878 0.908878 ZT12-15 0.94046775 0.725331 1.1556045000000001 ZT16-19 0.4401795 0.4401795 0.4401795 ZT20-23 2.20704 2.20704 2.20704