Background characteristics

Univariate

Multivariate

IRR (95% CI)

IRR (95% CI)

Age

15 - 19

20 - 34

35 - 49

1.00

1.49 (1.06 - 1.57)^***

1.29 (1.06 - 1.57)^**

1.00

2.23 (1.75 - 2.59)^***

2.35 (1.87 - 2.96)^***

Maternal education

Noformal education

Primary

Secondary or higher

1.00

1.13 (1.03 - 1.22)^**

0.73 (0.67 - 0.80)^***

1.00

1.58 (1.41 - 1.78)^***

0.98 (0.84 - 1.14)

Household wealth

Poor

Middle

Rich

1.00

0.64 (0.57 - 0.70)^***

0.63 (0.59 - 0.69)^***

1.00

0.52 (0.45 - 0.59)^***

0.60 (0.51 - 0.70)^***

Ethnicity

Hausa

Yoruba

Igbo

Fulani

Others

1.00

0.74 (0.66 - 0.83)^***

0.52 (0.45 - 0.60)^***

1.00 (0.88 - 1.14)

0.76 (0.70 - 0.83)^***

1.00

0.78 (0.65 - 0.94)^*

0.74 (0.62 - 0.89)^**

1.05 (0.91 - 1.22)

0.81 (0.72 - 0.90)^***