Table 4

Logistic regression models, U.S. adults aged 20 to 29 and aged 30 to 49 years

Parameter

Estimate (β)

Standard

Error

p

OR

95% CI

Ages 20-29

Intercept

-7.2449

0.7268

< 0.0001

-

-

Age, y

0.1327

0.0262

< 0.0001

1.14

(1.09, 1.20)

Sex ^a

1.1769

0.1483

< 0.0001

3.24

(2.43, 4.34)

Race ^b

1.7669

0.1410

< 0.0001

5.85

(4.44, 7.72)

Lifetime partners: 1 vs. 0

-0.7554

0.4934

0.1258

0.47

(0.18, 1.24)

Lifetime partners: 2 vs. 0

-0.2113

0.5046

0.6754

0.81

(0.30, 2.18)

Lifetime partners: 3-5 vs. 0

0.6451

0.3854

0.0942

1.91

(0.90, 4.06)

Lifetime partners: 6+ vs. 0

1.1957

0.3642

0.0010

3.31

(1.62, 6.75)

Ages 30-49

Intercept

-3.9644

0.4185

< 0.0001

-

-

Age, y

0.0481

0.00758

< 0.0001

^d

(1.03, 1.07)

Sex ^a

1.0727

0.0799

< 0.0001

2.92

(2.50, 3.42)

Race ^b

2.8982

0.4780

< 0.0001

^d

(7.11, 46.29)

Relationship status ^c

-0.3680

0.0803

< 0.0001

0.69

(0.59, 0.81)

Age*Race interaction

-0.0366

0.0119

0.0021

^d

(0.94, 0.99)

Lifetime partners: 1 vs. 0

-1.4657

0.2592

< 0.0001

0.23

(0.14, 0.38)

Lifetime partners: 2 vs. 0

-0.4669

0.2805

0.0960

0.63

(0.36, 1.09)

Lifetime partners: 3-5 vs. 0

0.1392

0.2068

0.5010

1.15

(0.77, 1.72)

Lifetime partners: 6+ vs. 0

0.6846

0.2188

0.0018

1.98

(1.29, 3.05)

a Coded 1 = female, 0 = male

b Coded 1 = Black, 0 = White, Hispanic or other

c Coded 1 = married/cohabitating, 0 = other

d An interaction between age and race resulted in varying ORs. For age, OR = 1.05 per year of age for white, Hispanic and others and OR = 1.01 per year of age for Blacks. For race, OR = 6.05 at age 30, OR = 4.20 at age 40, and OR = 3.02 at age 49.

Bauer et al. BMC Infectious Diseases 2010 10:359   doi:10.1186/1471-2334-10-359