condition mean min max ZT0-3 48.8 48.8 48.8 ZT4-7 42.8 42.8 42.8 ZT8-11 36.05 36.05 36.05 ZT12-15 39.25 39.25 39.25 ZT16-19 24.5 24.5 24.5 ZT20-23 25.75 25.75 25.75