Table 3 Factors associated with placental malaria among women with sample for both diagnosis, 2010–2014, Dar es Salaam, Tanzania (n = 941)^{a, b}

  ≤ 24

Ref

Ref

  ≥ 25

1.20 [0.88, 1.64]

1.15 [0.79, 1.68]

Gestational age in weeks^c

0.97 [0.92, 1.02]

1.08 [1.00, 1.15]

 Unemployed

Ref

Ref

 Employed^d

0.72 [0.52, 1.00]

0.69 [0.47, 1.00]

 Other

1.08 [0.75, 1.57]

0.49 [0.28, 0.86]

 0–7

2.21 [0.99, 4.97]

5.87 [1.25, 27.51]

 8–11

1.85 [0.80, 4.27]

6.48 [1.37, 30.68]

  ≥ 12

Ref

Ref

 1 (Lowest)

Ref

Ref

 2

0.78 [0.52, 1.18]

1.58 [1.00, 2.50]

 3

1.10 [0.77, 1.57]

0.91 [0.57 1.46]

 4 (Highest)

1.22 [0.82, 1.82]

1.53 [0.94, 2.48]

 First

0.94 [0.71, 1.25]

1.11 [0.79, 1.55]

 Second

Ref

Ref

 No

1.75 [1.05, 2.92]

1.45 [0.76, 2.74]

 Yes

Ref

Ref

Underweight

0.33 [0.17, 0.62]

0.78 [0.44, 1.36]

 Normal

Ref

Ref

 Overweight or obese

1.21 [0.90, 1.63]

1.48 [1.03, 2.11]

 Not anemic (Hb ≥ 11.0 g/dL)

Ref

Ref

 Anemic (Hb < 11.0 g/dL)

1.59 [1.20, 2.11]

1.70 [1.22, 2.38]