condition mean min max ZT0-3 19.4234 17.16805 21.4761 ZT4-7 18.3701 18.3701 18.3701 ZT8-11 23.99445 23.99445 23.99445 ZT12-15 30.6635 29.80885 31.51815 ZT16-19 27.106650000000002 27.106650000000002 27.106650000000002 ZT20-23 24.5816 24.5816 24.5816