Help with odds ratio and confidence intervals in logistic regression using spss?

I am attempting to use (SPSS) logistic regression to calculate odds ratios and confidence intervals for a small data set (N=60). The outcome variable is dichotomous (0=no, 1=yes) but the predictor variables seem a bit problematic. For example in one model I attempted to predict the odds that study participants who make less than 10K have had a mammogram in the past year. There were 7 study participants who met this criteria out of 60. When I attempt to run the ysis no confidence interval is reported. What does this mean? In addition warning msg says that the constant has been removed from the ysis. I admit that the study is poorly designed with regard to the way questions are worded and coded but I thought I would at least be able to carry some simple yses. Any help would be greatly appreciated.