condition mean min max ZT0-3 122.815668 122.815668 122.815668 ZT4-7 327.55733499999997 327.55733499999997 327.55733499999997 ZT8-11 370.053609 370.053609 370.053609 ZT12-15 349.72208550000005 349.72208550000005 349.72208550000005 ZT16-19 338.73022449999996 338.73022449999996 338.73022449999996 ZT20-23 263.1291455 263.1291455 263.1291455