condition mean min max ZT0-3 44.4106 36.27255 49.6953 ZT4-7 29.2555 29.2555 29.2555 ZT8-11 27.110300000000002 27.110300000000002 27.110300000000002 ZT12-15 48.976675 42.5742 55.37915 ZT16-19 42.093149999999994 42.093149999999994 42.093149999999994 ZT20-23 44.27775 44.27775 44.27775