condition mean min max ZT0-3 27.75 27.75 27.75 ZT4-7 25.2 25.2 25.2 ZT8-11 12.15 12.15 12.15 ZT12-15 33.1 33.1 33.1 ZT16-19 80.8 80.8 80.8 ZT20-23 51.65 51.65 51.65