condition mean min max ZT0-3 0.110167 0.0 0.213666 ZT4-7 0.3134845 0.3134845 0.3134845 ZT8-11 0.0 0.0 0.0 ZT12-15 0.110501 0.1045185 0.1164835 ZT16-19 0.0 0.0 0.0 ZT20-23 0.2299275 0.2299275 0.2299275