formatOptions=list(big.mark=",") not working for printing absolute frequencies of categorical variables with commas as thousands separators

[R-Joe]

The argument formatOptions = list(big.mark = ",") is not working for printing absolute frequencies of categorical variables with commas as thousands separators.
Consider the minimal example:

library(tableone)
library(survival)
tab <- CreateTableOne(vars= c("edrel","stage"), 
                      factorVars = "stage",
                      data = nwtco)
print(tab, formatOptions = list(big.mark = ","))

Which gives:

                    Overall            
  n                    4,028           
  edrel (mean (SD)) 2,276.68 (1,640.18)
  stage (%)                            
     1                  1572 (39.0)    
     2                  1052 (26.1)    
     3                   944 (23.4)    
     4                   460 (11.4) 

Any advice or suggestions would be greatly appreciated.