stata想输出带有显著性标识*，该怎么命令啊？（就是最基础的那种）

 regress birthweight unmarried alcohol nprevist smoker, vce(robust)

Linear regression                               Number of obs     =      3,000
                                                F(4, 2995)        =      56.09
                                                Prob > F          =     0.0000
                                                R-squared         =     0.0886
                                                Root MSE          =      565.7

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             |               Robust
 birthweight |      Coef.   Std. Err.      t    P>|t|     [95% Conf. Interval]
-------------+----------------------------------------------------------------
   unmarried |  -187.1332   27.67715    -6.76   0.000    -241.4014   -132.8651
     alcohol |  -21.08347   72.99211    -0.29   0.773    -164.2032    122.0363
    nprevist |   29.60254   3.582739     8.26   0.000     22.57766    36.62742
      smoker |  -175.3769    26.8268    -6.54   0.000    -227.9777   -122.7761
       _cons |     3134.4   44.14857    71.00   0.000     3047.835    3220.965
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