condition mean min max ZT0-3 26.70144 26.70144 26.70144 ZT4-7 18.360967000000002 18.360967000000002 18.360967000000002 ZT8-11 16.2522285 16.2522285 16.2522285 ZT12-15 19.095638 19.095638 19.095638 ZT16-19 24.2827965 24.2827965 24.2827965 ZT20-23 20.8253795 20.8253795 20.8253795