condition mean min max ZT0-3 0.42164233333333334 0.326243 0.5215744999999999 ZT4-7 0.290808 0.290808 0.290808 ZT8-11 0.8746515 0.8746515 0.8746515 ZT12-15 2.0097449999999997 1.509725 2.509765 ZT16-19 1.221555 1.221555 1.221555 ZT20-23 0.886725 0.886725 0.886725