condition mean min max ZT0-3 1.6332401557499998 1.6310986795 1.6353816319999999 ZT4-7 1.738267368 1.1839152755 2.2926194605 ZT8-11 7.8476485700000005 3.3889374934999994 12.3063596465 ZT12-15 29.649042440000002 26.57307263 32.725012250000006 ZT16-19 39.2371402575 37.529047225 40.945233290000004 ZT20-23 45.969620094999996 36.33857547 55.60066472