condition mean min max ZT0-3 259.914998 259.914998 259.914998 ZT4-7 231.64508 231.64508 231.64508 ZT8-11 230.12588 230.12588 230.12588 ZT12-15 255.23085199999997 255.23085199999997 255.23085199999997 ZT16-19 195.86988250000002 195.86988250000002 195.86988250000002 ZT20-23 215.659037 215.659037 215.659037