condition mean min max ZT0-3 216.9 216.9 216.9 ZT4-7 275.2 275.2 275.2 ZT8-11 259.0 259.0 259.0 ZT12-15 248.35 248.35 248.35 ZT16-19 285.20000000000005 285.20000000000005 285.20000000000005 ZT20-23 248.75 248.75 248.75