condition mean min max ZT0-3 30.6261 30.6261 30.6261 ZT4-7 19.10635 19.10635 19.10635 ZT8-11 19.389699999999998 19.389699999999998 19.389699999999998 ZT12-15 17.7563 17.7563 17.7563 ZT16-19 27.7914 27.7914 27.7914 ZT20-23 28.83265 28.83265 28.83265