Call:
lm(formula = y ~ x)

Residuals:
      Min        1Q    Median        3Q       Max 
-0.057018 -0.026305 -0.002762  0.014292  0.147595 

Coefficients:
              Estimate Std. Error t value   Pr(>|t|)    
(Intercept)   0.030936   0.006072   5.095 0.00000106 ***
xNA          -0.002762   0.038402  -0.072   0.942761    
xnon-Annex I  0.026090   0.007075   3.688   0.000319 ***
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Residual standard error: 0.03792 on 146 degrees of freedom
Multiple R-squared:  0.08711,	Adjusted R-squared:  0.0746 
F-statistic: 6.966 on 2 and 146 DF,  p-value: 0.00129