condition mean min max ZT0-3 13.3 13.3 13.3 ZT4-7 19.0 19.0 19.0 ZT8-11 41.5 41.5 41.5 ZT12-15 30.2 30.2 30.2 ZT16-19 37.25 37.25 37.25 ZT20-23 17.05 17.05 17.05