condition mean min max ZT0-3 28.1 28.1 28.1 ZT4-7 21.4 21.4 21.4 ZT8-11 24.25 24.25 24.25 ZT12-15 24.45 24.45 24.45 ZT16-19 33.55 33.55 33.55 ZT20-23 55.5 55.5 55.5