condition mean min max ZT0-3 15.2 15.2 15.2 ZT4-7 9.1 9.1 9.1 ZT8-11 30.25 30.25 30.25 ZT12-15 21.35 21.35 21.35 ZT16-19 37.2 37.2 37.2 ZT20-23 19.45 19.45 19.45