condition mean min max ZT0-3 0.3799945 0.22645949999999998 0.5335295 ZT4-7 0.230234 0.230234 0.230234 ZT8-11 0.4585095 0.4585095 0.4585095 ZT12-15 0 0 0 ZT16-19 0.3747865 0.3747865 0.3747865 ZT20-23 0.301853 0.301853 0.301853