condition mean min max ZT0-3 40.839125 33.7933 47.88495 ZT4-7 48.518 48.518 48.518 ZT8-11 73.86785 73.86785 73.86785 ZT12-15 0 0 0 ZT16-19 89.39920000000001 89.39920000000001 89.39920000000001 ZT20-23 68.76535000000001 68.76535000000001 68.76535000000001