condition mean min max ZT0-3 151.625492 151.625492 151.625492 ZT4-7 229.43643350000002 229.43643350000002 229.43643350000002 ZT8-11 232.752355 232.752355 232.752355 ZT12-15 243.9321785 243.9321785 243.9321785 ZT16-19 221.6149475 221.6149475 221.6149475 ZT20-23 324.40152650000005 324.40152650000005 324.40152650000005