condition mean min max ZT0-3 83.001656 83.001656 83.001656 ZT4-7 152.3243905 152.3243905 152.3243905 ZT8-11 155.5168195 155.5168195 155.5168195 ZT12-15 121.0114605 121.0114605 121.0114605 ZT16-19 105.23786849999999 105.23786849999999 105.23786849999999 ZT20-23 108.637142 108.637142 108.637142