condition mean min max ZT0-3 10.880669 10.880669 10.880669 ZT4-7 11.4404035 11.4404035 11.4404035 ZT8-11 11.3966355 11.3966355 11.3966355 ZT12-15 10.887129999999999 10.887129999999999 10.887129999999999 ZT16-19 10.659713 10.659713 10.659713 ZT20-23 10.4881305 10.4881305 10.4881305