condition mean min max ZT0-3 425.850731 425.850731 425.850731 ZT4-7 194.790498 194.790498 194.790498 ZT8-11 178.47137750000002 178.47137750000002 178.47137750000002 ZT12-15 326.46621749999997 326.46621749999997 326.46621749999997 ZT16-19 529.825664 529.825664 529.825664 ZT20-23 910.5856855 910.5856855 910.5856855