condition mean min max ZT0-3 45.4 45.4 45.4 ZT4-7 27.7 27.7 27.7 ZT8-11 46.5 46.5 46.5 ZT12-15 30.95 30.95 30.95 ZT16-19 12.1 12.1 12.1 ZT20-23 38.7 38.7 38.7