condition mean min max ZT0-3 0.25822925 0.21171600000000002 0.3047425 ZT4-7 0.5382515 0.5382515 0.5382515 ZT8-11 0.4083575 0.4083575 0.4083575 ZT12-15 0 0 0 ZT16-19 0.38415849999999996 0.38415849999999996 0.38415849999999996 ZT20-23 0.35391950000000005 0.35391950000000005 0.35391950000000005