condition mean min max ZT0-3 0.568473 0.568473 0.568473 ZT4-7 0.217029 0.217029 0.217029 ZT8-11 1.3886930000000002 1.3886930000000002 1.3886930000000002 ZT12-15 0.3913845 0.3913845 0.3913845 ZT16-19 0.532725 0.532725 0.532725 ZT20-23 0.5349945 0.5349945 0.5349945