condition mean min max ZT0-3 10.00393 10.00393 10.00393 ZT4-7 8.223075 8.223075 8.223075 ZT8-11 7.503825 7.503825 7.503825 ZT12-15 9.20056 9.20056 9.20056 ZT16-19 11.77415 11.77415 11.77415 ZT20-23 11.3589 11.3589 11.3589