condition mean min max ZT0-3 42.9 42.9 42.9 ZT4-7 20.4 20.4 20.4 ZT8-11 40.3 40.3 40.3 ZT12-15 47.8 47.8 47.8 ZT16-19 38.4 38.4 38.4 ZT20-23 47.35 47.35 47.35