condition mean min max ZT0-3 22.55 22.55 22.55 ZT4-7 18.6 18.6 18.6 ZT8-11 12.25 12.25 12.25 ZT12-15 15.8 15.8 15.8 ZT16-19 29.65 29.65 29.65 ZT20-23 4.6 4.6 4.6