condition mean min max ZT0-3 14.4 14.4 14.4 ZT4-7 46.7 46.7 46.7 ZT8-11 50.95 50.95 50.95 ZT12-15 31.3 31.3 31.3 ZT16-19 31.7 31.7 31.7 ZT20-23 26.05 26.05 26.05