condition mean min max ZT0-3 14.15 14.15 14.15 ZT4-7 25.6 25.6 25.6 ZT8-11 32.55 32.55 32.55 ZT12-15 17.85 17.85 17.85 ZT16-19 33.6 33.6 33.6 ZT20-23 19.9 19.9 19.9