condition mean min max ZT0-3 66.56335 66.56335 66.56335 ZT4-7 88.20365000000001 88.20365000000001 88.20365000000001 ZT8-11 28.70475 28.70475 28.70475 ZT12-15 7.5482700000000005 7.5482700000000005 7.5482700000000005 ZT16-19 11.950800000000001 11.950800000000001 11.950800000000001 ZT20-23 28.09635 28.09635 28.09635