condition mean min max ZT0-3 111.6 111.6 111.6 ZT4-7 146.4 146.4 146.4 ZT8-11 151.05 151.05 151.05 ZT12-15 126.75 126.75 126.75 ZT16-19 127.0 127.0 127.0 ZT20-23 77.55 77.55 77.55