condition mean min max ZT0-3 221.2 221.2 221.2 ZT4-7 56.4 56.4 56.4 ZT8-11 260.25 260.25 260.25 ZT12-15 339.65000000000003 339.65000000000003 339.65000000000003 ZT16-19 311.65 311.65 311.65 ZT20-23 151.8 151.8 151.8