Summary statistics for cstratm variable in nhamcsed2013 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
     cstratm |     24,777    3.17e+07     9899301   2.01e+07   4.04e+07

by Jean Roth , jroth@nber.org , 7 Nov 2016