condition mean min max ZT0-3 18.1 18.1 18.1 ZT4-7 38.5 38.5 38.5 ZT8-11 32.05 32.05 32.05 ZT12-15 42.8 42.8 42.8 ZT16-19 24.5 24.5 24.5 ZT20-23 49.45 49.45 49.45