When comparisons are made within age, gender, and racial cohorts, the differences are much less dramatic.[15][16] Although suicides may be notably more prevalent among police, it is not clear whether police suicides are the result of work stress or the consequence of other variables, such as the influence of a subculture of violence[17] Police officers are not more likely to experience interpersonal relationship problems. In a 2009 study, the divorce rates of law enforcement personnel were compared with the rates for other occupations, where data was analyzed from the 2000 U.S. Census. The results of the analysis indicate that the divorce rate for law enforcement personnel is lower than that of the general population, even after controlling for demographic and other job-related variables.[18] The propensity to domestic violence is also thought to be higher for police officers than the general population, though the statistics are very fuzzy and controversial.