condition mean min max ZT0-3 0.01626132925 0.0 0.0325226585 ZT4-7 0.008161653 0.0 0.016323306 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0125869665 0.0 0.025173933 ZT16-19 0.010074712000000001 0.0 0.020149424000000003 ZT20-23 0.021976210333333333 0.0 0.043952420666666665