Before Matching

Total 313 observation with C-Alb value. PD (Modality = 0) subjects are significantly younger than HD (Modality = 1) subjects.

## 
##  Welch Two Sample t-test
## 
## data:  AGE by Modality
## t = -7.7374, df = 253.66, p-value = 2.403e-13
## alternative hypothesis: true difference in means is not equal to 0
## 95 percent confidence interval:
##  -15.563139  -9.248044
## sample estimates:
## mean in group 0 mean in group 1 
##        56.57851        68.98410

After Matching

We are able to match 98 pairs. Age is no longer significantly different between two groups.

## 
##  Welch Two Sample t-test
## 
## data:  AGE by Modality
## t = -0.50268, df = 191.88, p-value = 0.6158
## alternative hypothesis: true difference in means is not equal to 0
## 95 percent confidence interval:
##  -4.275323  2.538732
## sample estimates:
## mean in group 0 mean in group 1 
##        59.29897        60.16726

Baseline C-Alb

Baseline C-Alb values are significantly higher in PD subjects than in HD subjects.

## 
##  Welch Two Sample t-test
## 
## data:  Baseline.C.Alb by Modality
## t = 2.1616, df = 191.55, p-value = 0.03189
## alternative hypothesis: true difference in means is not equal to 0
## 95 percent confidence interval:
##  0.1101943 2.4079031
## sample estimates:
## mean in group 0 mean in group 1 
##        11.37818        10.11913