condition mean min max ZT0-3 11.75 11.75 11.75 ZT4-7 69.8 69.8 69.8 ZT8-11 25.2 25.2 25.2 ZT12-15 48.95 48.95 48.95 ZT16-19 60.5 60.5 60.5 ZT20-23 32.75 32.75 32.75