condition mean min max ZT0-3 151.30898 151.30898 151.30898 ZT4-7 250.6791275 250.6791275 250.6791275 ZT8-11 269.7590825 269.7590825 269.7590825 ZT12-15 481.82510849999994 481.82510849999994 481.82510849999994 ZT16-19 285.59222650000004 285.59222650000004 285.59222650000004 ZT20-23 509.4993125 509.4993125 509.4993125