condition mean min max ZT0-3 69.6 69.6 69.6 ZT4-7 32.5 32.5 32.5 ZT8-11 55.0 55.0 55.0 ZT12-15 66.35 66.35 66.35 ZT16-19 45.15 45.15 45.15 ZT20-23 64.75 64.75 64.75