condition mean min max ZT0-3 19.00855 18.351799999999997 19.665300000000002 ZT4-7 12.388349999999999 12.388349999999999 12.388349999999999 ZT8-11 14.1128 14.1128 14.1128 ZT12-15 0 0 0 ZT16-19 19.5079 19.5079 19.5079 ZT20-23 20.242449999999998 20.242449999999998 20.242449999999998