Summary statistics for cstratm variable in nhamcsopd2011 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
     cstratm |     32,233    2.97e+07     9990236   2.01e+07   4.04e+07

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