condition mean min max ZT0-3 0.031194683333333334 0.0217141 0.040901900000000005 ZT4-7 0.0098259 0.0098259 0.0098259 ZT8-11 0.009987 0.009987 0.009987 ZT12-15 0.015368074999999998 0.0 0.030736149999999997 ZT16-19 0.0096461 0.0096461 0.0096461 ZT20-23 0.0322434 0.0322434 0.0322434