condition mean min max ZT0-3 0.3317695 0.286767 0.376772 ZT4-7 0.38288849999999996 0.38288849999999996 0.38288849999999996 ZT8-11 0.6492915 0.6492915 0.6492915 ZT12-15 0 0 0 ZT16-19 0.65787 0.65787 0.65787 ZT20-23 0.494927 0.494927 0.494927