condition mean min max ZT0-3 0.23798770000000002 0.1315569 0.3444185 ZT4-7 1.1019375 1.1019375 1.1019375 ZT8-11 0.130078 0.130078 0.130078 ZT12-15 0 0 0 ZT16-19 0.3023209 0.3023209 0.3023209 ZT20-23 0.3035985 0.3035985 0.3035985