condition mean min max ZT0-3 27.3 27.3 27.3 ZT4-7 20.4 20.4 20.4 ZT8-11 35.65 35.65 35.65 ZT12-15 20.35 20.35 20.35 ZT16-19 14.55 14.55 14.55 ZT20-23 20.1 20.1 20.1