condition mean min max ZT0-3 28.415599999999998 26.24795 30.58325 ZT4-7 34.46895 34.46895 34.46895 ZT8-11 59.19915 59.19915 59.19915 ZT12-15 0 0 0 ZT16-19 52.224149999999995 52.224149999999995 52.224149999999995 ZT20-23 33.49335 33.49335 33.49335