condition mean min max ZT0-3 67.85 67.85 67.85 ZT4-7 77.4 77.4 77.4 ZT8-11 39.95 39.95 39.95 ZT12-15 25.6 25.6 25.6 ZT16-19 64.35 64.35 64.35 ZT20-23 84.4 84.4 84.4