condition mean min max ZT0-3 26.75 26.75 26.75 ZT4-7 49.5 49.5 49.5 ZT8-11 32.15 32.15 32.15 ZT12-15 27.15 27.15 27.15 ZT16-19 29.15 29.15 29.15 ZT20-23 27.5 27.5 27.5