condition mean min max ZT0-3 27.927149999999997 14.74325 37.42335 ZT4-7 12.485199999999999 12.485199999999999 12.485199999999999 ZT8-11 17.70065 17.70065 17.70065 ZT12-15 22.745775000000002 21.1219 24.36965 ZT16-19 24.67655 24.67655 24.67655 ZT20-23 32.07325 32.07325 32.07325