condition mean min max ZT0-3 0.538987 0.4535825 0.6243915 ZT4-7 1.045037 1.045037 1.045037 ZT8-11 1.67873 1.67873 1.67873 ZT12-15 0 0 0 ZT16-19 1.0250685 1.0250685 1.0250685 ZT20-23 0.5379345 0.5379345 0.5379345