condition mean min max ZT0-3 645.001528 645.001528 645.001528 ZT4-7 658.8725615 658.8725615 658.8725615 ZT8-11 575.1105825 575.1105825 575.1105825 ZT12-15 723.2161309999999 723.2161309999999 723.2161309999999 ZT16-19 549.057874 549.057874 549.057874 ZT20-23 469.60920999999996 469.60920999999996 469.60920999999996