condition mean min max ZT0-3 23.100166666666667 17.63895 30.628099999999996 ZT4-7 27.378700000000002 27.378700000000002 27.378700000000002 ZT8-11 19.06615 19.06615 19.06615 ZT12-15 15.496199999999998 15.1397 15.852699999999999 ZT16-19 24.55005 24.55005 24.55005 ZT20-23 21.771900000000002 21.771900000000002 21.771900000000002