condition mean min max ZT0-3 9.766858894999999 6.44550941 13.08820838 ZT4-7 6.188595804249999 4.6265881925 7.750603415999999 ZT8-11 11.1452958635 9.309182702 12.981409025000001 ZT12-15 8.5827507195 7.411837704 9.753663735 ZT16-19 5.258748692499999 4.5185004079999995 5.998996976999999 ZT20-23 10.92718909825 9.7355883815 12.118789815000001