Compare the second output object that is created for CityPop_90 to the second output object that is created for NonCityPop_90. These objects are marked with an arrow (<--). The names and labels of these objects are identical. Thus, using a name or a label can refer to multiple output objects, which is sometimes useful. If you want to reference each output object separately, you must use its path, which is unique. 
36   options nodate pageno=1 linesize=64 pagesize=60;
37   ods trace on;
38   
39   proc univariate data=statepop mu0=3.5;
40      var citypop_90 noncitypop_90;
41      title;
42   run;

Output Added:     
-------------
Name:       Moments
Label:      Moments
Template:   base.univariate.Moments
Path:       Univariate.CityPop_90.Moments
-------------

Output Added:   
-------------
Name:       BasicMeasures   <--
Label:      Basic Measures of Location and Variability
Template:   base.univariate.Measures
Path:       Univariate.CityPop_90.BasicMeasures
-------------

Output Added:
-------------
Name:       TestsForLocation

Label:      Tests For Location
Template:   base.univariate.Location
Path:       Univariate.CityPop_90.TestsForLocation
-------------

Output Added:
-------------
Name:       Quantiles
Label:      Quantiles
Template:   base.univariate.Quantiles
Path:       Univariate.CityPop_90.Quantiles
-------------

Output Added:
-------------
Name:       ExtremeObs
Label:      Extreme Observations
Template:   base.univariate.ExtObs
Path:       Univariate.CityPop_90.ExtremeObs
-------------
Output Added:
-------------
Name:       Moments     
Label:      Moments
Template:   base.univariate.Moments
Path:       Univariate.NonCityPop_90.Moments
-------------

Output Added:   
-------------
Name:       BasicMeasures   <-- 
Label:      Basic Measures of Location and Variability
Template:   base.univariate.Measures
Path:       Univariate.NonCityPop_90.BasicMeasures
-------------

Output Added:
-------------
Name:       TestsForLocation
Label:      Tests For Location
Template:   base.univariate.Location
Path:       Univariate.NonCityPop_90.TestsForLocation
-------------

Output Added:
-------------
Name:       Quantiles
Label:      Quantiles
Template:   base.univariate.Quantiles
Path:       Univariate.NonCityPop_90.Quantiles
-------------

Output Added:
-------------
Name:       ExtremeObs
Label:      Extreme Observations
Template:   base.univariate.ExtObs
Path:       Univariate.NonCityPop_90.ExtremeObs
-------------

Output Added:
-------------
Name:       MissingValues
Label:      Missing Values
Template:   base.univariate.Missings
Path:       Univariate.NonCityPop_90.MissingValues
-------------