condition mean min max ZT0-3 30.0 30.0 30.0 ZT4-7 28.5 28.5 28.5 ZT8-11 30.85 30.85 30.85 ZT12-15 29.3 29.3 29.3 ZT16-19 19.1 19.1 19.1 ZT20-23 25.349999999999998 25.349999999999998 25.349999999999998