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 0.004806034 0.0 0.009612068 ZT16-19 0.0 0.0 0.0 ZT20-23 0.021528659999999998 0.0139928285 0.029064491499999998