condition mean min max ZT0-3 45.25 45.25 45.25 ZT4-7 36.7 36.7 36.7 ZT8-11 40.15 40.15 40.15 ZT12-15 38.55 38.55 38.55 ZT16-19 22.55 22.55 22.55 ZT20-23 49.75 49.75 49.75