condition mean min max ZT0-3 0.89662575 0.7765385 1.016713 ZT4-7 0.6863945 0.6863945 0.6863945 ZT8-11 0.5239815 0.5239815 0.5239815 ZT12-15 0 0 0 ZT16-19 0.5897779999999999 0.5897779999999999 0.5897779999999999 ZT20-23 0.7584815 0.7584815 0.7584815