condition mean min max ZT0-3 80.9 80.9 80.9 ZT4-7 38.7 38.7 38.7 ZT8-11 32.5 32.5 32.5 ZT12-15 22.95 22.95 22.95 ZT16-19 9.05 9.05 9.05 ZT20-23 48.55 48.55 48.55