Perform a paired ttest on two substracts of the same variable

I have a dataset that looks like this:

var1	var2	var3	attribute
1	0.93	0.88	1
1	0.76	0.20	1
1	0.40	0.18	0
0	0.34	0.91	1
0	0.09	0.51	0
...	...	...	...

For each variable (var1, var2, var3, etc), I need to perfom a ttest compairing its mean when attribute = 1 vs the mean of the whole variable. How can I do this?

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