condition mean min max ZT0-3 4.82694296675 4.3479810815 5.305904852 ZT4-7 3.7314511555 3.6349582729999996 3.827944038 ZT8-11 2.8836509710000002 2.6977724355 3.0695295065000003 ZT12-15 5.6336811765 3.688433817 7.578928535999999 ZT16-19 13.204347817750001 10.8909732355 15.5177224 ZT20-23 22.9258269175 19.54008519 26.311568645