condition mean min max ZT0-3 67.0 67.0 67.0 ZT4-7 52.8 52.8 52.8 ZT8-11 47.95 47.95 47.95 ZT12-15 48.05 48.05 48.05 ZT16-19 77.6 77.6 77.6 ZT20-23 40.3 40.3 40.3