condition mean min max ZT0-3 23.652075 20.82365 26.4805 ZT4-7 32.907399999999996 32.907399999999996 32.907399999999996 ZT8-11 11.15915 11.15915 11.15915 ZT12-15 0 0 0 ZT16-19 15.17315 15.17315 15.17315 ZT20-23 19.009700000000002 19.009700000000002 19.009700000000002