Table 3 Results from bivariable and multivariable logistic regression

Age at first menstruation

 < 15 years

0.91 [0.83–1.01]

0.89 [0.81–0.99]*

 15 years and above

Ref.

Ref.

Covariates

 Educational level

  No education

Ref.

  Primary

1.48 [1.29–1.70]***

  Secondary

2.96 [2.59–3.38]***

  Higher

4.35 [3.50–5.40]***

 Age

  15–19 years

Ref.

  20–24 years

1.39 [1.19–1.61]***

  25–29 years

1.46 [1.24–1.72]***

  30–34 years

1.51 [1.28–1.78]***

  35–39 years

1.49 [1.24–1.77]***

  40–44 years

1.45 [1.19–1.76]***

  45–49 years

1.35 [1.08–1.68]***

 Place of residence

  Urban

Ref.

  Rural

0.84 [0.74–0.95]**

 Frequency of reading newspaper/magazine

  Not at all

Ref.

  Less than once a week

1.26 [1.06–1.49]**

  At least once a week

1.31 [1.05–1.63]**

 Frequency of listening to radio

   Not at all

Ref.

  Less than once a week

1.00 [0.88–1.14]

  At least once a week

1.14 [0.99–1.31]

 Frequency of watching television

  Not at all

Ref.

  Less than once a week

1.16 [0.99–1.37]

  At least once a week

1.00 [0.87–1.16]

 Wealth index

  Poorest

Ref.

  Poorer

1.22 [1.01–1.47]*

  Middle

1.42 [1.18–1.72]***

  Richer

1.75 [1.42–2.15]***

  Richest

2.11 [1.69–2.64]***

 Distance to health facility

  Big problem

Ref.9587

  Not a big problem

0.96 [0.87–1.07]

Model fitness

  Constant

0.18 [0.17–0.19]***

0.06 [0.05–0.07]***

  Pseudo R²

0.0474

0.0811

  Prob > chi2

0.0003

0.0000

  AIC

12,308.42

11,355.22