condition mean min max ZT0-3 54.55 54.55 54.55 ZT4-7 15.2 15.2 15.2 ZT8-11 18.15 18.15 18.15 ZT12-15 52.0 52.0 52.0 ZT16-19 25.65 25.65 25.65 ZT20-23 46.3 46.3 46.3