Table 3 Multivariate logistic regression parameter estimates. The estimates are presented in the odds ratio (OR) scale accompanied by 95% confidence interval in brackets

(Intercept)

0.1 (0.0-0.3)

< 0.001

Age (ref = 18–24)

25+

13.8 (11.4–16.6)

< 0.001

Year (ref = 2011)

2020

2.6 (1.2–5.6)

0.015

Marital Status (ref = Never married)

Married/living in union

2.4 (1.4–4.1)

< 0.001

Separated/divorced/widowed

1.6 (0.9–2.9)

0.106

Worked in the last 12 months prior to the survey (ref = No)

Yes

1.9 (1.6–2.4)

< 0.001

Sexual identity (ref = Heterosexual)

Bisexual

0.6 (0.3–1.2)

0.147

Gay/homosexual

2 (0.9–4.2)

0.053

Other

2 (0.7–5.2)

0.147

Province (ref = Maputo)

Beira

0.4 (0.3–0.6)

< 0.001

Nampula

0.8 (0.4–1.3)

0.327

Age at first anal intercourse (ref = < 15)

15–17

0.5 (0.3–0.8)

0.007

18–20

0.3 (0.2–0.5)

< 0.001

21+

0.2 (0.1–0.4)

< 0.001

Number of male sexual partners in the last 12 months prior to the survey (ref= <=1)

2

0.4 (0.2–0.8)

0.009

3+

0.6 (0.3–1.2)

0.129

Received money and services in exchange for sex in the last 12 months (ref = No)

Yes

1.3 (0.6–2.6)

0.542

Ever had a diagnosis or symptoms of STI in the last 12 months prior to the survey (ref = No)

Yes

1.9 (1.6–2.3)

< 0.001

Ever looked for health professional (ref = No)

Yes

1.7 (1.2–2.4)

0.002

Tested and received results in the 12 months prior to the survey (ref = No)

Yes

0.5 (0.4–0.7)

< 0.001

Circumcision (ref = No)

Yes

0.4 (0.3–0.6)

< 0.001

How often do use lubrication for anal sex (ref = Never)

Sometimes

1.5 (0.9–2.4)

0.082

Always

2.8 (1.7–4.4)

< 0.001

Age x Year

25 + X Year

0.2 (0.1–0.4)

< 0.001

Number of male sexual partners in the last 12 months prior to the survey (ref=<=1) X Year

2 X Year

3.7 (1.5–9.3)

0.006

3 + X Year

2 (0.8–4.8)

0.125

Gave money, goods, services in exchange for sex X Year

0.3 (0.1–0.7)

0.006