condition mean min max ZT0-3 892.232057 892.232057 892.232057 ZT4-7 800.3650319999999 800.3650319999999 800.3650319999999 ZT8-11 279.6994015 279.6994015 279.6994015 ZT12-15 204.14824199999998 204.14824199999998 204.14824199999998 ZT16-19 66.5051055 66.5051055 66.5051055 ZT20-23 43.342802999999996 43.342802999999996 43.342802999999996