condition mean min max ZT0-3 56.3 56.3 56.3 ZT4-7 23.1 23.1 23.1 ZT8-11 26.3 26.3 26.3 ZT12-15 29.4 29.4 29.4 ZT16-19 19.05 19.05 19.05 ZT20-23 42.35 42.35 42.35