condition mean min max ZT0-3 13.8250875 10.247895 17.40228 ZT4-7 23.641750000000002 23.641750000000002 23.641750000000002 ZT8-11 33.6497 33.6497 33.6497 ZT12-15 0 0 0 ZT16-19 45.58325000000001 45.58325000000001 45.58325000000001 ZT20-23 33.6904 33.6904 33.6904