The study also says that white adults are more likely to be concerned about pollution than black adults. "White adults are more likely to express greater awareness, concern and annoyance about pollution than black adults." The authors explain that these results hold true even after accounting for factors such as socioeconomic status, education, access to information, pollution levels and others. "Regression analysis showed that these differences persisted even after accounting for factors that were thought to explain racial differences in attitudes - SSE, number of years of education, access to information, actual and perceived levels of pollution, and feelings of efficacy." "Racial differences...also remain relatively unchanged after controlling for occupational status - further evidence that race is an important cause of differences in attitudes toward the environment. Whites continue to place a higher value on public participation in land conservation." "In these responses, little influence of SSE is observed. Moreover, racial differences are as pronounced in the white and physical categories as in the sample as a whole."