condition mean min max ZT0-3 30.206046 30.206046 30.206046 ZT4-7 22.365943 22.365943 22.365943 ZT8-11 26.388339000000002 26.388339000000002 26.388339000000002 ZT12-15 125.117544 125.117544 125.117544 ZT16-19 63.744575999999995 63.744575999999995 63.744575999999995 ZT20-23 178.9710715 178.9710715 178.9710715