condition mean min max ZT0-3 32.145575 21.8587 42.43245 ZT4-7 19.0582 19.0582 19.0582 ZT8-11 19.9598 19.9598 19.9598 ZT12-15 30.5219625 30.304724999999998 30.7392 ZT16-19 32.572383333333335 28.68936666666667 36.4554 ZT20-23 0 0 0