I have a spss data set in which post abortion women are followed up for 12 months, and their use of contraceptives are asked for every month. So in my dataset I have got 12 variables (for each month) about the use of contraceptive. For example
Variables Values
month1 0=no use, 1=condom, 2=oral pills 3=implant
month2 0=no use, 1=condom, 2=oral pills 3=implant
so on upto month12

Now how can I create the required variable like time, status and factors for survival analysis. Please help me out