condition mean min max ZT0-3 40.45 40.45 40.45 ZT4-7 59.5 59.5 59.5 ZT8-11 36.6 36.6 36.6 ZT12-15 27.7 27.7 27.7 ZT16-19 37.95 37.95 37.95 ZT20-23 47.2 47.2 47.2