condition mean min max ZT0-3 6.5437101347499995 5.5474502165 7.539970052999999 ZT4-7 0.72143357975 0.42928815149999994 1.013579008 ZT8-11 0.3068416605 0.2758307675 0.3378525535 ZT12-15 0.9995544165 0.5882054800000001 1.410903353 ZT16-19 2.83273531825 2.4359837079999997 3.2294869285 ZT20-23 4.79722401625 3.502624708 6.0918233245