condition mean min max ZT0-3 559.27721045 329.6735548 788.8808661 ZT4-7 1316.67975475 1159.3175285 1474.041981 ZT8-11 953.2958871 705.97499625 1200.61677795 ZT12-15 53.66574909775 7.978200548 99.3532976475 ZT16-19 32.0784692775 21.28757227 42.869366285 ZT20-23 45.33320294 35.220930185 55.445475695