condition mean min max ZT0-3 0.0090868 0.0090868 0.0090868 ZT4-7 0.0125488 0.0125488 0.0125488 ZT8-11 0.02396935 0.02396935 0.02396935 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0440679 0.0440679 0.0440679 ZT20-23 0.049042050000000004 0.049042050000000004 0.049042050000000004