condition mean min max ZT0-3 33.7 33.7 33.7 ZT4-7 43.7 43.7 43.7 ZT8-11 43.9 43.9 43.9 ZT12-15 36.75 36.75 36.75 ZT16-19 71.55 71.55 71.55 ZT20-23 49.15 49.15 49.15