> ba.mod1 <- lmer(bac ~ brtime + (1|subject))
> summary(ba.mod1)
Linear mixed model fit by REML t-tests use Satterthwaite approximations to
  degrees of freedom [lmerMod]
Formula: bac ~ brtime + (1 | subject)

REML criterion at convergence: -664.5

Scaled residuals: 
    Min      1Q  Median      3Q     Max 
-3.2793 -0.2920 -0.0148  0.2415  3.3710 

Random effects:
 Groups   Name        Variance  Std.Dev.
 subject  (Intercept) 3.663e-04 0.019139
 Residual             1.659e-05 0.004073
Number of obs: 90, groups:  subject, 9

Fixed effects:
             Estimate Std. Error        df t value Pr(>|t|)    
(Intercept) 1.007e-01  6.447e-03 8.270e+00  15.615    2e-07 ***
brtime      8.613e-05  1.495e-04 8.010e+01   0.576    0.566    
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Correlation of Fixed Effects:
       (Intr)
brtime -0.128
> ba.mod2 <- lmer(bac ~ brtime + (1 + brtime|subject))
> summary(ba.mod2)
Linear mixed model fit by REML t-tests use Satterthwaite approximations to
  degrees of freedom [lmerMod]
Formula: bac ~ brtime + (1 + brtime | subject)

REML criterion at convergence: -668.9

Scaled residuals: 
    Min      1Q  Median      3Q     Max 
-3.2718 -0.1061  0.0027  0.1043  2.7073 

Random effects:
 Groups   Name        Variance  Std.Dev.  Corr 
 subject  (Intercept) 3.704e-04 0.0192446      
          brtime      2.837e-07 0.0005326 -0.11
 Residual             1.425e-05 0.0037750      
Number of obs: 90, groups:  subject, 9

Fixed effects:
             Estimate Std. Error        df t value Pr(>|t|)    
(Intercept) 1.007e-01  6.472e-03 8.000e+00  15.554 2.91e-07 ***
brtime      8.613e-05  2.252e-04 8.000e+00   0.382    0.712    
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Correlation of Fixed Effects:
       (Intr)
brtime -0.158
> 
> ba.mod3 <- lmer(bac ~ brtime*male + (1 + brtime|subject))
> summary(ba.mod3)
Linear mixed model fit by REML t-tests use Satterthwaite approximations to
  degrees of freedom [lmerMod]
Formula: bac ~ brtime * male + (1 + brtime | subject)

REML criterion at convergence: -650.4

Scaled residuals: 
    Min      1Q  Median      3Q     Max 
-3.2436 -0.0812  0.0029  0.0948  2.7660 

Random effects:
 Groups   Name        Variance  Std.Dev.  Corr 
 subject  (Intercept) 3.379e-04 0.0183811      
          brtime      3.444e-07 0.0005869 -0.19
 Residual             1.425e-05 0.0037750      
Number of obs: 90, groups:  subject, 9

Fixed effects:
             Estimate Std. Error        df t value Pr(>|t|)    
(Intercept) 9.151e-02  9.281e-03 7.000e+00   9.860 2.35e-05 ***
brtime      2.045e-05  3.596e-04 7.000e+00   0.057    0.956    
male        1.649e-02  1.245e-02 7.000e+00   1.325    0.227    
brtime:male 1.182e-04  4.824e-04 7.000e+00   0.245    0.813    
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Correlation of Fixed Effects:
            (Intr) brtime male  
brtime      -0.224              
male        -0.745  0.167       
brtime:male  0.167 -0.745 -0.224
>