. sum

    Variable |       Obs        Mean    Std. Dev.       Min        Max
-------------+--------------------------------------------------------
         day |         7           1           0          1          1
        year |         7    2005.286    7.040698       1991       2011
     country |         0
       study |         0
          dn |         7    16.85714    11.66803          6         38
-------------+--------------------------------------------------------
          dm |         7    14.02571    3.834401        8.5         19
          ds |         7    5.448572    3.270578          1         10
          sn |         7    23.28571    14.02039         10         51
          sm |         7    12.95286    4.237431       7.83       19.9
          ss |         7    5.165714    2.857661        1.8          9

. list

     +----------------------------------------------------------------------------+
     | day   year   country          study   dn      dm     ds   sn     sm     ss |
     |----------------------------------------------------------------------------|
  1. |   1   2011      中国         陈裕胜   11    14.4      1   10   12.7    1.8 |
  2. |   1   2011      中国         梁道业    9     8.5   2.69   23   7.83   2.36 |
  3. |   1   2009      中国           徐波    8    18.7    8.1   12   19.9      8 |
  4. |   1   2007      中国           顾勤    6   12.48   6.55   14   9.04    5.3 |
  5. |   1   2006      中国         杨从山   24    11.1    6.8   26   12.2    6.7 |
     |----------------------------------------------------------------------------|
  6. |   1   2002      德国    Samir Sakka   22      14      3   27     12      3 |
  7. |   1   1991      美国   Dan Schuller   38      19     10   51     17      9 |
     +----------------------------------------------------------------------------+

. metan  dn- ss,fixed lcols( day year country) texts(200) boxsca(200) nowt

           Study     |     SMD   [95% Conf. Interval]    
---------------------+---------------------------------------------------
1                    |  1.184       0.249     2.120       
1                    |  0.273      -0.501     1.047       
1                    | -0.149      -1.045     0.747       
1                    |  0.606      -0.370     1.583       
1                    | -0.163      -0.719     0.393       
1                    |  0.667       0.088     1.246       
1                    |  0.212      -0.209     0.633       
---------------------+---------------------------------------------------
I-V pooled SMD       |  0.290       0.047     0.532       
---------------------+---------------------------------------------------

  Heterogeneity chi-squared =   9.15 (d.f. = 6) p = 0.165
  I-squared (variation in SMD attributable to heterogeneity) =  34.4%

  Test of SMD=0 : z=   2.34 p = 0.019

http://s1/middle/9b332cf4nb3d393ab5b40&690

. metafunnel  _ES _seES

http://s12/middle/9b332cf4nb3d39b84872b&690
. metabias  _ES _seES,begg

Note: data input format theta se_theta assumed.

Begg's test for small-study effects:
Rank correlation between standardized intervention effect and its standard error
 
  adj. Kendall's Score (P-Q) =       7
          Std. Dev. of Score =    6.66
           Number of Studies =       7
                          z  =    1.05
                    Pr > |z| =   0.293
                          z  =    0.90 (continuity corrected)
                    Pr > |z| =   0.368 (continuity corrected)

. metabias  _ES _seES,egger

Note: data input format theta se_theta assumed.

Egger's test for small-study effects:
Regress standard normal deviate of intervention
effect estimate against its standard error

Number of studies =  7                                 Root MSE      =   1.269
------------------------------------------------------------------------------
     Std_Eff |      Coef.   Std. Err.      t    P>|t|     [95% Conf. Interval]
-------------+----------------------------------------------------------------
       slope |  -.1250773     .52751    -0.24   0.822    -1.481085     1.23093
        bias |    1.32596   1.609626     0.82   0.448    -2.811715    5.463634
------------------------------------------------------------------------------

Test of H0: no small-study effects          P = 0.448