condition mean min max ZT0-3 8.759045 8.759045 8.759045 ZT4-7 10.137656 10.137656 10.137656 ZT8-11 10.713886500000001 10.713886500000001 10.713886500000001 ZT12-15 9.771034499999999 9.771034499999999 9.771034499999999 ZT16-19 9.9486885 9.9486885 9.9486885 ZT20-23 9.724356499999999 9.724356499999999 9.724356499999999