condition mean min max ZT0-3 40.3 40.3 40.3 ZT4-7 36.7 36.7 36.7 ZT8-11 32.4 32.4 32.4 ZT12-15 47.75 47.75 47.75 ZT16-19 61.3 61.3 61.3 ZT20-23 55.95 55.95 55.95