condition mean min max ZT0-3 18.45 18.45 18.45 ZT4-7 36.6 36.6 36.6 ZT8-11 20.35 20.35 20.35 ZT12-15 5.3 5.3 5.3 ZT16-19 25.65 25.65 25.65 ZT20-23 23.75 23.75 23.75