data 是下面这样，有4个变量，后面的三个变量都为各组人数
Population: all enrolled      65 50 115
Received treatment          63 48 111
Still on treatment              24 22 46
Discontinued treatment    39 26 65
Adverse event                  4 5 9
Physician decision             1 2 3
Progressive disease           32 17 49
Withdrawal of consent      2 2 4

现在想得到下面的效果，但要用DATA输出，分别多了三个变量PERSENT

Population: all enrolled	65	50	115
Received treatment	63 (96.9%)	48 (96.0%)	111 (96.5%)
Still on treatment	24 (36.9%)	22 (44.0%)	46 (40.0%)
Discontinued treatment	39 (60.0%)	26 (52.0%)	65 (56.5%)
Reason for discontinuation
Adverse event	4 (6.2%)	5 (10.0%)	9 (7.8%)
Physician decision	1 (1.5%)	2 (4.0%)	3 (2.6%)
Progressive disease	32 (49.2%)	17 (34.0%)	49 (42.6%)
Withdrawal of consent	2 (3.1%)	2 (4.0%)	4 (3.5%)

就是第一行人数在每一列作为分母的
我是新手，不知怎么写CODE好，，求助高人，先谢啦！