condition mean min max ZT0-3 26.930233333333334 25.12075 28.96685 ZT4-7 26.5554 26.5554 26.5554 ZT8-11 43.937 43.937 43.937 ZT12-15 43.8513 37.30445 50.39815 ZT16-19 31.048650000000002 31.048650000000002 31.048650000000002 ZT20-23 33.699 33.699 33.699