condition mean min max ZT0-3 34.349925 34.0895 34.61035 ZT4-7 36.682649999999995 36.682649999999995 36.682649999999995 ZT8-11 40.663 40.663 40.663 ZT12-15 0 0 0 ZT16-19 44.567099999999996 44.567099999999996 44.567099999999996 ZT20-23 38.35155 38.35155 38.35155