condition mean min max ZT0-3 80.83698333333334 41.2287 147.9065 ZT4-7 60.21395 60.21395 60.21395 ZT8-11 18.769 18.769 18.769 ZT12-15 22.86825 21.2708 24.4657 ZT16-19 61.92205 61.92205 61.92205 ZT20-23 84.25874999999999 84.25874999999999 84.25874999999999