condition mean min max ZT0-3 28.6 28.6 28.6 ZT4-7 18.9 18.9 18.9 ZT8-11 18.85 18.85 18.85 ZT12-15 52.75 52.75 52.75 ZT16-19 39.55 39.55 39.55 ZT20-23 35.45 35.45 35.45