Table 4 Survey-weighted multivariable logistic regression analysis to determine factors associated with HIV/AIDS knowledge level over years using the Multiple Indicator Cluster Surveys 2007, 2011, and 2016–2017 among women 15–49 years in Nigeria

 15–19

Ref

Ref

Ref

Ref

Ref

Ref

 20–24

1.27 (1.11;1.45)**

1.34 (1.16;1.55)***

1.14 (1.01;1.28)*

1.25 (1.12;1.40)***

1.10 (0.97;1.24)

1.03 (0.89;1.19)

 25–29

1.21 (1.06;1.39)**

1.34 (1.15;1.57)***

1.26 (1.11;1.43)***

1.32 (1.14;1.52)***

1.13 (1.00;1.28)*

1.07 (0.91;1.26)

 30–34

1.13 (0.98;1.29)

1.31 (1.10;1.56)**

1.29 (1.15;1.46)***

1.43 (1.22;1.67)***

1.10 (0.97;1.24)

0.99 (0.84;1.17)

 35–39

1.16 (1.01;1.34)*

1.45 (1.22;1.73)***

1.26 (1.12;1.43)***

1.37 (1.17;1.60)***

1.13 (0.99;1.28)

1.11 (0.93;1.33)

 40–44

0.85 (0.74;0.99)*

1.15 (0.95;1.38)

1.13 (0.98;1.29)

1.41 (1.19;1.68)***

1.15 (1.00;1.32)

1.28 (1.06;1.55)*

 45–49

0.98 (0.84;1.15)

1.42 (1.15;1.76)**

1.12 (0.97;1.30)

1.50 (1.25;1.80)***

0.96 (0.82;1.11)

1.08 (0.89;1.31)

 Currently married

Ref

Ref

Ref

Ref

Ref

Ref

 Formerly married

0.89 (0.75;1.06)

0.99 (0.82;1.19)

1.05 (0.89;1.23)

0.94 (0.78;1.13)

1.35 (1.15;1.60)***

1.30 (1.08;1.57)***

 Never married

1.16 (1.05;1.28)**

1.13 (0.97;1.30)

1.14 (1.04;1.26)**

1.08 (0.93;1.25)

1.21 (1.10;1.33)***

1.43 (1.25;1.64)***

 None

Ref

Ref

Ref

Ref

Ref

Ref

 Non-formal

1.19 (1.06;1.34)**

1.39 (1.21;1.60)***

–

–

1.19 (1.04;1.37)*

1.08 (0.92;1.26)

 Primary

1.92 (1.72;2.15)***

2.01 (1.73;2.34)***

1.57 (1.37;1.79)***

1.37 (1.18;1.58)***

1.61 (1.40;1.85)***

1.24 (1.06;1.45)**

 Secondary and above

1.56 (1.06;2.30)*

1.22 (0.83;1.80)

2.73 (2.39;3.11)***

2.05 (1.76;2.38)***

3.68 (3.09;4.38)***

2.01 (1.64;2.46)***

 Higher

–

–

–

–

1.13 (0.94;1.36)

1.06 (0.87;1.31)

 Poorest

Ref

Ref

Ref

Ref

Ref

Ref

 Second

1.23 (1.05;1.45)*

1.12 (0.96;1.32)

1.47 (1.27;1.70)***

1.32 (1.11;1.59)**

1.10 (0.95;1.29)

1.02 (0.88;1.19)

 Middle

1.59 (1.33;1.91)***

1.41 (1.18;1.68)***

2.29 (1.98;2.64)***

1.71 (1.40;2.08)***

1.35 (1.13;1.62)**

1.07 (0.88;1.30)

 Fourth

1.69 (1.41;2.02)***

1.43 (1.18;1.74)***

2.90 (2.48;3.39)***

1.74 (1.40;2.18)***

1.65 (1.40;1.95)***

1.03 (0.84;1.26)

 Richest

2.61 (2.16;3.15)***

1.95 (1.56;2.43)***

3.94 (3.38;4.59)***

1.99 (1.60;2.46)***

2.68 (2.28;3.15)***

1.31 (1.06;1.63)*

 Rural

Ref

Ref

Ref

Ref

Ref

Ref

 Urban

1.56 (1.37;1.77)***

1.09 (0.93;1.27)

1.79 (1.57;2.03)***

1.20 (0.99;1.45)

1.91 (1.70;2.15)***

1.40 (1.21;1.61)***

 North Central

Ref

Ref

Ref

Ref

Ref

Ref

 North East

0.56 (0.44–0.73)***

0.82 (0.64;1.04)

1.02 (0.75;1.40)

1.79 (1.34;2.40)***

1.29 (1.04;1.60)*

1.61 (1.32;1.98)***

 North West

1.57 (1.29;1.90)***

2.22 (1.83;2.70)***

1.38 (1.11;1.72)**

2.22 (1.74;2.85)***

1.21 (1.03;1.42)*

1.66 (1.39;1.99)***

 South East

1.30 (1.08;1.58)**

0.90 (0.74;1.08)

1.86 (1.58;2.19)***

1.61 (1.36;1.90)***

1.12 (0.96;1.31)

0.92 (0.78;1.07)

 South South

1.12 (0.92;1.36)

0.84 (0.69;1.02)

2.18 (1.82;2.60)***

1.79 (1.50;2.15)***

1.32 (1.13;1.55)***

1.14 (0.97;1.35)

 South West

1.30 (1.07;1.57)**

0.84 (0.70;1.02)

2.32 (1.98;2.73)***

1.61 (1.34;1.93)***

1.52 (1.29;1.79)***

1.07 (0.90;1.27)

 No

Ref

Ref

Ref

Ref

Ref

Ref

 Yes

1.55 (1.34;1.81)***

1.27 (1.08;1.49)**

2.10 (1.89;2.32)***

1.50 (1.36;1.66)***

2.30 (2.09;2.52)***

2.16 (1.93;2.41)***