condition mean min max ZT0-3 0.021540275 0.0 0.04308055 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.03403475 0.0 0.0680695 ZT16-19 0.01620773333333333 0.0 0.03241546666666666 ZT20-23 0 0 0