condition mean min max ZT0-3 10.287136 10.287136 10.287136 ZT4-7 9.459868 9.459868 9.459868 ZT8-11 10.831571499999999 10.831571499999999 10.831571499999999 ZT12-15 9.6846995 9.6846995 9.6846995 ZT16-19 9.664833 9.664833 9.664833 ZT20-23 9.457544500000001 9.457544500000001 9.457544500000001