condition mean min max ZT0-3 0.5398081666666666 0.240559 0.8643125 ZT4-7 0.2876645 0.2876645 0.2876645 ZT8-11 0.414292 0.414292 0.414292 ZT12-15 0.8271417499999999 0.583432 1.0708514999999998 ZT16-19 0.844714 0.844714 0.844714 ZT20-23 0.6990775 0.6990775 0.6990775