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 0.0 0.0 0.0 ZT16-19 0.010100477 0.0 0.020200954 ZT20-23 0.010988105166666666 0.0 0.021976210333333333