condition mean min max ZT0-3 0.474046592 0.43769785099999997 0.5103953330000001 ZT4-7 0.386706887 0.323657633 0.449756141 ZT8-11 0.28939527433333334 0.20725977299999998 0.3715307756666667 ZT12-15 0.402336143 0.30339804566666667 0.5012742403333333 ZT16-19 0.617075335 0.320077296 0.9140733740000001 ZT20-23 0.584625517 0.555058101 0.614192933