condition mean min max ZT0-3 14.290904 14.290904 14.290904 ZT4-7 11.8011745 11.8011745 11.8011745 ZT8-11 12.856044 12.856044 12.856044 ZT12-15 13.6608315 13.6608315 13.6608315 ZT16-19 16.157432 16.157432 16.157432 ZT20-23 12.880249 12.880249 12.880249