condition mean min max ZT0-3 134.461066 134.461066 134.461066 ZT4-7 54.4014145 54.4014145 54.4014145 ZT8-11 69.00904750000001 69.00904750000001 69.00904750000001 ZT12-15 57.399575999999996 57.399575999999996 57.399575999999996 ZT16-19 117.954131 117.954131 117.954131 ZT20-23 119.87965500000001 119.87965500000001 119.87965500000001