condition mean min max ZT0-3 1.04031525 0.8542555000000001 1.226375 ZT4-7 1.7074449999999999 1.7074449999999999 1.7074449999999999 ZT8-11 2.143345 2.143345 2.143345 ZT12-15 0 0 0 ZT16-19 2.52004 2.52004 2.52004 ZT20-23 2.108395 2.108395 2.108395