condition mean min max ZT0-3 12.110192496499998 11.771520713 12.448864279999999 ZT4-7 11.2223365085 10.216544857 12.22812816 ZT8-11 11.649793477 10.90925933 12.390327624 ZT12-15 10.491854866 9.906343154 11.077366578 ZT16-19 13.30005672 12.889925776666667 13.710187663333334 ZT20-23 11.1610019705 10.476023104333333 11.845980836666667