condition mean min max ZT0-3 239.45 239.45 239.45 ZT4-7 262.5 262.5 262.5 ZT8-11 252.85000000000002 252.85000000000002 252.85000000000002 ZT12-15 288.25 288.25 288.25 ZT16-19 350.25 350.25 350.25 ZT20-23 247.25 247.25 247.25