condition mean min max ZT0-3 22.8 22.8 22.8 ZT4-7 24.5 24.5 24.5 ZT8-11 18.75 18.75 18.75 ZT12-15 39.45 39.45 39.45 ZT16-19 27.85 27.85 27.85 ZT20-23 39.15 39.15 39.15