condition mean min max ZT0-3 224.603824 224.603824 224.603824 ZT4-7 325.746815 325.746815 325.746815 ZT8-11 448.758282 448.758282 448.758282 ZT12-15 802.7442665 802.7442665 802.7442665 ZT16-19 167.99506000000002 167.99506000000002 167.99506000000002 ZT20-23 357.781598 357.781598 357.781598