condition mean min max ZT0-3 13.55 13.55 13.55 ZT4-7 36.7 36.7 36.7 ZT8-11 6.85 6.85 6.85 ZT12-15 32.2 32.2 32.2 ZT16-19 24.75 24.75 24.75 ZT20-23 32.9 32.9 32.9