condition mean min max ZT0-3 2.5956099999999998 2.5956099999999998 2.5956099999999998 ZT4-7 1.37894 1.37894 1.37894 ZT8-11 2.767275 2.767275 2.767275 ZT12-15 1.96712 1.96712 1.96712 ZT16-19 4.03763 4.03763 4.03763 ZT20-23 2.512425 2.512425 2.512425