condition mean min max ZT0-3 9.429423333333334 7.797085 10.850815 ZT4-7 4.59687 4.59687 4.59687 ZT8-11 5.13075 5.13075 5.13075 ZT12-15 4.0939475 2.598545 5.58935 ZT16-19 5.94173 5.94173 5.94173 ZT20-23 11.08921 11.08921 11.08921