condition mean min max ZT0-3 38.75 38.75 38.75 ZT4-7 16.7 16.7 16.7 ZT8-11 83.85 83.85 83.85 ZT12-15 96.85 96.85 96.85 ZT16-19 76.95 76.95 76.95 ZT20-23 69.9 69.9 69.9