condition mean min max ZT0-3 49.7 49.7 49.7 ZT4-7 24.3 24.3 24.3 ZT8-11 25.6 25.6 25.6 ZT12-15 33.3 33.3 33.3 ZT16-19 37.25 37.25 37.25 ZT20-23 83.25 83.25 83.25