condition mean min max ZT0-3 1027.237013 1027.237013 1027.237013 ZT4-7 351.911245 351.911245 351.911245 ZT8-11 122.9775605 122.9775605 122.9775605 ZT12-15 138.9678115 138.9678115 138.9678115 ZT16-19 1492.168545 1492.168545 1492.168545 ZT20-23 3227.5782105 3227.5782105 3227.5782105