Plastic Surgery and Suicide

According to the study conducted by Swedish scientists, the suicide rate among women who undergo breast augmentation procedure is three times higher than in women who do not. Records of 3,521 women have been analyzed in the study which has tried to link this particular plastic surgery procedure with the act of suicide. Observed sample was consisted of women who had undergone surgery between 1965 and 1993 and were from 15 to 69 years old.
Over 240,000 women decide to enlarge their breasts each year in the US. But this particular study has been conducted on the population of Swedish women. (We should not assume that American women follow the same pattern, right?!?). http://news.bbc.co.uk/1/hi/health/2826933.stm
This article does not give much background information on the sample. I am not sure if all the suicide risk factors for have been taken into consideration in the study. When analyzing suicide risk factors - data on demographics, marital status, race, income, etc. has to be included. Does this mean that women who decide to surgically enlarge their breasts might have some serious psychological problems?