condition mean min max ZT0-3 45.75 45.75 45.75 ZT4-7 7.6 7.6 7.6 ZT8-11 25.85 25.85 25.85 ZT12-15 36.7 36.7 36.7 ZT16-19 39.55 39.55 39.55 ZT20-23 23.2 23.2 23.2