Summary statistics for cstratm variable in nhamcsopd2009 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
     cstratm |     33,551    3.01e+07    1.00e+07   2.01e+07   4.04e+07

by Jean Roth , jroth@nber.org , 28 Mar 2016