Table 3 Crude and adjusted incidence rate ratios (IRR) of low birth weight, maternal anaemia and perinatal mortality by trimester of malaria infection using Poisson regression

Maternal anaemia

   No infection (391/816)

1.00

1.00

   Infection in 1^st trimester (15/31)

1.00 (0.69-1.46)

0.98 (0.67-1.42)

   Infection in 2^nd trimester (34/69)

1.03 (0.80-1.32)

0.99 (0.76-1.27)

   Infection in 3^rd trimester (58/118)

1.02 (0.84-1.24)

0.97 (0.79-1.20)

Low birth weight

   No infection(96/816)

1.00

1.00

   Infection in 1^st trimester (13/31)

3.56 (2.26-5.61) ^a

2.07 (1.30-3.27) ^b

   Infection in 2^nd trimester (14/69)

1.72 (1.04-2.85) ^c

1.09 (0.65-1.82)

   Infection in 3^rd trimester (16/118)

1.15 (0.70-1.88)

0.78 (0.46-1.32)

Perinatal mortality

   No infection(15/816)

1.00

1.00

   Infection in 1^st trimester (0/31)

-

-

   Infection in 2^nd trimester (3/69)

2.36 (0.70-7.97)

1.18 (0.31-4.47)

   Infection in 3^rd trimester (1/118)

0.46 (0.06-3.46)

0.37 (0.04-2.81)