condition mean min max ZT0-3 1.34303775 0.8921655 1.79391 ZT4-7 1.27912 1.27912 1.27912 ZT8-11 3.84734 3.84734 3.84734 ZT12-15 0 0 0 ZT16-19 0.6301615 0.6301615 0.6301615 ZT20-23 1.264046 1.264046 1.264046