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 0.027502532333333333 0.025173933 0.029831131666666667 ZT16-19 0.010100477 0.0 0.020200954 ZT20-23 0.0 0.0 0.0