condition mean min max ZT0-3 16.319525 14.1422 18.49685 ZT4-7 19.955199999999998 19.955199999999998 19.955199999999998 ZT8-11 23.8175 23.8175 23.8175 ZT12-15 28.404937500000003 24.847875000000002 31.962 ZT16-19 25.720583333333334 25.072966666666666 26.3682 ZT20-23 0 0 0