condition mean min max ZT0-3 68.95 68.95 68.95 ZT4-7 65.2 65.2 65.2 ZT8-11 8.35 8.35 8.35 ZT12-15 27.5 27.5 27.5 ZT16-19 73.45 73.45 73.45 ZT20-23 33.9 33.9 33.9