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Table 2 Prevalence of birth weights below 2,500 g (LBW) in Kenya and Tanzania in prospective and historical sample

From: Improving birth weight measurement and recording practices in Kenya and Tanzania: a prospective intervention study with historical controls

 

Prospective Sample (95% CI)

Historical Sample (95% CI)

Absolute difference in LBW prevalence (95% CI)

Risk ratio (95% CI)

Kenya

Number of births

8441

9318

N/A

N/A

Proportion of birth weights < 2500 g

12.6% (10.9; 14.4)

7.8% (6.5; 9.2)

4.8% (3.2; 6.4)

1.61 (1.38; 1.88)

Adjusted LBW% proportion of birth weights < 2500 g*

12.9% (11.2; 14.6)

8.5% (7.1; 9.9)

4.3% (2.7; 6.0)

1.51 (1.29; 1.77)

Tanzania

Number of observations

4294

12,007

N/A

N/A

Proportion of birth weights < 2500 g

18.2% (12.2; 24.2)

10.0% (8.6; 11.4)

8.2% (2.3; 14.0)

1.81 (1.30; 2.52)

Adjusted LBW% proportion of birth weights < 2500 g*

18.5% (12.7; 24.2)

11.4% (9.9; 12.9)

7.1 (1.9; 12.3)

1.62 (1.23; 2.13)

  1. *Adjusted LBW prevalence was calculated after reallocating 25% of 2500 g infants to be LBW