condition mean min max ZT0-3 0.3859708333333333 0.21145000000000003 0.642675 ZT4-7 0.12287975000000001 0.12287975000000001 0.12287975000000001 ZT8-11 0.253076 0.253076 0.253076 ZT12-15 0.379468 0.3624185 0.3965175 ZT16-19 0.6718275 0.6718275 0.6718275 ZT20-23 0.7588735 0.7588735 0.7588735