
    Variable |          N       Mean         SD        Min        Max
-------------+-------------------------------------------------------
 PM25_growth |  7887.0000    -0.0394     0.1029    -1.0311     0.6471
       lPM25 |  7887.0000    11.1626     0.7049     7.1002    14.4976
  GDP_growth |  7887.0000     0.1005     0.1158    -1.0825     0.9859
         rev |  7887.0000     0.0632     0.0447     0.0053     1.5278
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