condition mean min max ZT0-3 8.544605 8.544605 8.544605 ZT4-7 9.33604 9.33604 9.33604 ZT8-11 4.468534999999999 4.468534999999999 4.468534999999999 ZT12-15 2.735685 2.735685 2.735685 ZT16-19 5.62285 5.62285 5.62285 ZT20-23 6.620915 6.620915 6.620915