condition mean min max ZT0-3 25.6 25.6 25.6 ZT4-7 27.3 27.3 27.3 ZT8-11 36.3 36.3 36.3 ZT12-15 42.55 42.55 42.55 ZT16-19 19.0 19.0 19.0 ZT20-23 26.1 26.1 26.1