condition mean min max ZT0-3 33.2 33.2 33.2 ZT4-7 19.7 19.7 19.7 ZT8-11 24.35 24.35 24.35 ZT12-15 41.55 41.55 41.55 ZT16-19 42.8 42.8 42.8 ZT20-23 18.9 18.9 18.9