condition mean min max ZT0-3 43.0 43.0 43.0 ZT4-7 4.8 4.8 4.8 ZT8-11 23.9 23.9 23.9 ZT12-15 33.05 33.05 33.05 ZT16-19 13.9 13.9 13.9 ZT20-23 21.35 21.35 21.35