Call:
lm(formula = y ~ x)

Residuals:
     Min       1Q   Median       3Q      Max 
-0.16186 -0.03437 -0.01586 -0.00401  0.66197 

Coefficients:
                    Estimate Std. Error t value  Pr(>|t|)    
(Intercept)          0.11471    0.02636   4.352 0.0000155 ***
xCaribbean          -0.08118    0.03250  -2.498  0.012719 *  
xCentral America    -0.10085    0.03064  -3.291  0.001048 ** 
xCentral Asia       -0.10946    0.04121  -2.656  0.008089 ** 
xEastern Africa     -0.07842    0.02992  -2.621  0.008973 ** 
xEastern Asia       -0.07677    0.03228  -2.378  0.017677 *  
xEastern Europe     -0.09885    0.03034  -3.258  0.001177 ** 
xMelanesia          -0.06939    0.03601  -1.927  0.054417 .  
xMicronesia         -0.03903    0.03601  -1.084  0.278806    
xMiddle Africa      -0.11414    0.03728  -3.062  0.002285 ** 
xNA                 -0.10672    0.03298  -3.236  0.001269 ** 
xNorthern Africa    -0.11441    0.03997  -2.862  0.004338 ** 
xNorthern America    0.04715    0.04121   1.144  0.252951    
xNorthern Europe    -0.06271    0.02842  -2.207  0.027665 *  
xPolynesia          -0.09131    0.03601  -2.536  0.011448 *  
xSouth America      -0.10312    0.02931  -3.518  0.000463 ***
xSouth-Eastern Asia -0.07975    0.03000  -2.658  0.008038 ** 
xSouthern Africa    -0.10113    0.03805  -2.658  0.008039 ** 
xSouthern Asia      -0.05574    0.03208  -1.737  0.082753 .  
xSouthern Europe    -0.09253    0.02936  -3.152  0.001695 ** 
xWestern Africa     -0.11070    0.03025  -3.659  0.000272 ***
xWestern Asia       -0.08031    0.03208  -2.503  0.012539 *  
xWestern Europe     -0.09816    0.02850  -3.445  0.000607 ***
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Residual standard error: 0.09504 on 689 degrees of freedom
Multiple R-squared:  0.07064,	Adjusted R-squared:  0.04097 
F-statistic: 2.381 on 22 and 689 DF,  p-value: 0.0004024