condition mean min max ZT0-3 0.341267 0.341267 0.341267 ZT4-7 0.45344799999999996 0.45344799999999996 0.45344799999999996 ZT8-11 0.39117250000000003 0.39117250000000003 0.39117250000000003 ZT12-15 0.570092 0.570092 0.570092 ZT16-19 0.594151 0.594151 0.594151 ZT20-23 0.6362363333333334 0.6362363333333334 0.6362363333333334