condition mean min max ZT0-3 239.75 239.75 239.75 ZT4-7 200.2 200.2 200.2 ZT8-11 187.7 187.7 187.7 ZT12-15 182.2 182.2 182.2 ZT16-19 232.85000000000002 232.85000000000002 232.85000000000002 ZT20-23 263.25 263.25 263.25