condition mean min max ZT0-3 161.95 161.95 161.95 ZT4-7 207.9 207.9 207.9 ZT8-11 231.5 231.5 231.5 ZT12-15 213.3 213.3 213.3 ZT16-19 203.10000000000002 203.10000000000002 203.10000000000002 ZT20-23 173.25 173.25 173.25