condition mean min max ZT0-3 44.4213 40.35205 48.49055 ZT4-7 25.56635 25.56635 25.56635 ZT8-11 22.332900000000002 22.332900000000002 22.332900000000002 ZT12-15 0 0 0 ZT16-19 35.339349999999996 35.339349999999996 35.339349999999996 ZT20-23 35.585 35.585 35.585