condition mean min max ZT0-3 41.7 41.7 41.7 ZT4-7 37.4 37.4 37.4 ZT8-11 36.75 36.75 36.75 ZT12-15 30.65 30.65 30.65 ZT16-19 23.8 23.8 23.8 ZT20-23 60.8 60.8 60.8