condition mean min max ZT0-3 54.85 54.85 54.85 ZT4-7 20.4 20.4 20.4 ZT8-11 22.9 22.9 22.9 ZT12-15 58.8 58.8 58.8 ZT16-19 43.95 43.95 43.95 ZT20-23 62.05 62.05 62.05