condition mean min max ZT0-3 202.470247 202.470247 202.470247 ZT4-7 174.7467525 174.7467525 174.7467525 ZT8-11 203.42616700000002 203.42616700000002 203.42616700000002 ZT12-15 251.08331299999998 251.08331299999998 251.08331299999998 ZT16-19 166.95930700000002 166.95930700000002 166.95930700000002 ZT20-23 192.1270765 192.1270765 192.1270765