Risk factors for dental trauma over a person's lifetime:
(1) male gender
(2) mental distress (anxiety and/or depression, antisocial personality)
(3) history of previous traumatic injury
(4) overweight (body mass index >= 25.0)
(5) high alcohol consumption
(7) physically inactive (regular physical activity reduces trauma occurrence)
(8) unemployed or self-employed (higher status associated with reduced risk)
(9) maxillary protrusion, increased overjet, and/or retrognathic mandible
(10) age under 30 years of age (81% of dental injury occurs before age 30)
(11) although not listed by the authors, I would include participants in sports (like hockey) or occupations with a lot of physical contact.
Comment: This sounds like the average clientele for a biker bar.
Some possible explanations for these findings:
(1) self-destructive behavior
(2) reduced coordination
(3) teeth more vulnerable (with maxillary protrusion, etc.)
(4) prevalence of events in the environment