condition mean min max ZT0-3 48.75 48.75 48.75 ZT4-7 68.7 68.7 68.7 ZT8-11 58.8 58.8 58.8 ZT12-15 58.6 58.6 58.6 ZT16-19 90.95 90.95 90.95 ZT20-23 32.8 32.8 32.8