condition mean min max ZT0-3 0.25844163333333336 0.0879919 0.584295 ZT4-7 5.61498 5.61498 5.61498 ZT8-11 7.51973 7.51973 7.51973 ZT12-15 2.7758140000000004 1.282073 4.269555 ZT16-19 0.5769029999999999 0.5769029999999999 0.5769029999999999 ZT20-23 0.23126950000000002 0.23126950000000002 0.23126950000000002