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| Overall U. S. Prevalence | Calin et al (1977) % | ESSG(1991) % | Berlin (2006) % | Berlin (2006) % |
|---|---|---|---|---|
| Age group | 5.0 | 5.6 | 5.8 | 6.0 |
| 20-35 years | 5.0 | 5.0 | 4.8 | 6.2 |
| 36-49 years | 5.9 | 6.8 | 6.8 | 5.9 |
| 40-69 years | 4.1 | 5.0 | n.a | n.a |
| Sex | ||||
| Male | 5.2 | 5.6 | 5.6 | 5.4 |
| Female | 4.9 | 5.6 | 6.1 | 6.7 |
| Racial/ethnic groups | ||||
| Mexican-Americans | 4.1 | 4.4 | 4.9 | 4.2 |
| Caucasians-not Hispanic | 5.9 | 6.5 | 6.6 | 7.2 |
| Afro-Americans | 3.3 | 4.1 | 5.5 | 5.1 |
