condition mean min max ZT0-3 5.6921862625 4.814439203999999 6.569933321000001 ZT4-7 3.019256584 2.6632130370000002 3.375300131 ZT8-11 4.89097072625 3.90179672 5.8801447325 ZT12-15 6.211130653750001 5.519589854 6.9026714535 ZT16-19 5.1712974155 4.436789585 5.905805246 ZT20-23 10.860265010749998 9.163371286499999 12.557158735