condition mean min max ZT0-3 20.5 20.5 20.5 ZT4-7 36.6 36.6 36.6 ZT8-11 72.1 72.1 72.1 ZT12-15 40.6 40.6 40.6 ZT16-19 46.3 46.3 46.3 ZT20-23 42.85 42.85 42.85