condition mean min max ZT0-3 0.8901368310000001 0.703135083 1.077138579 ZT4-7 0.6039271402499999 0.586865574 0.6209887064999999 ZT8-11 0.5450079369999999 0.4074299445 0.6825859295 ZT12-15 0.582457744 0.5764646595 0.5884508285000001 ZT16-19 0.93887764375 0.688804486 1.1889508015 ZT20-23 2.22764227925 2.002420837 2.4528637215