Call:
lm(formula = sr ~ sb + lc + ic + age)

Residuals:
    Min      1Q  Median      3Q     Max 
-3.6216 -0.6050  0.1987  0.7769  2.4119 

Coefficients:
             Estimate Std. Error t value Pr(>|t|)    
(Intercept)  0.305027   1.162047   0.262 0.793077    
sb           0.248655   0.069447   3.581 0.000385 ***
lc           0.117814   0.080613   1.461 0.144665    
ic           0.037903   0.039285   0.965 0.335214    
age         -0.006444   0.003258  -1.978 0.048585 *  
---
Signif. codes:  0 `***' 0.001 `**' 0.01 `*' 0.05 `.' 0.1 ` ' 1 

Residual standard error: 1.195 on 402 degrees of freedom
Multiple R-Squared: 0.07773,	Adjusted R-squared: 0.06855 
F-statistic:  8.47 on 4 and 402 DF,  p-value: 1.436e-06