condition mean min max ZT0-3 16.35 16.35 16.35 ZT4-7 25.8 25.8 25.8 ZT8-11 41.65 41.65 41.65 ZT12-15 37.6 37.6 37.6 ZT16-19 34.1 34.1 34.1 ZT20-23 24.1 24.1 24.1