condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.036261291333333334 0.022174716666666667 0.050347866 ZT16-19 0.010100477 0.0 0.020200954 ZT20-23 0.0 0.0 0.0