Age category
0 = 11 to 17 years
1 = 18 to 26 years

Race/ethnicity
0 = White
1 = Black
2 = Hispanic
3 = Other/Unknown

Did the patient complete the three-shot regimen?
0 = No
1 = Yes

Type of insurance
0 = Medical assistance
1 = Private payer
2 = Hospital based [EHF]
3 = Military

Clinic location
1 = Odenton
2 = White Marsh
3 = Johns Hopkins Outpatient Center
4 = Bayview

Was the clinic in a suburban or an ubran location?
0 = Suburban
1 = Urban

0 = Pediatric
1 = Family practice
2 = OB-GYN