condition mean min max ZT0-3 45.7 45.7 45.7 ZT4-7 53.7 53.7 53.7 ZT8-11 32.75 32.75 32.75 ZT12-15 22.25 22.25 22.25 ZT16-19 8.45 8.45 8.45 ZT20-23 10.65 10.65 10.65