Table 1

Odds ratios (OR) and 95% confidence intervals (CI) for all comparisons of mortality associated with the intervention period, both within the Femina cohort (actual study), outside the study area (trends unrelated to study), and between the study area and the rest of Norway, stratified by the data sources available for the comparison.

Comparison

Femina area: Intervention period vs. pre-intervention period

Rest of Norway: Intervention period vs. pre-intervention period

Femina area vs. rest of Norway prior to intervention period

Femina area vs. rest of Norway during intervention period

Group & data source

OR

95% CI

OR

95% CI

OR

95% CI

OR

95% CI

Original comparison

Femina data

0.69

0.50 - 0.96

-

-

-

-

-

-

MBRN data

-

-

-

-

-

-

-

-

Cross-validated data

-

-

-

-

-

-

-

-

≥ 32 weeks or 1500 g

Femina data

0.74

0.50 - 1.08

-

-

-

-

-

-

MBRN data

0.71

0.48 - 1.05

1.11

0.71 - 1.73

1.16

0.71 - 1.88

0.74

0.53 - 1.04

Cross-validated data

0.72

0.50 - 1.03

-

-

-

-

-

-

≥ 28 weeks or 1000 g

Femina data

0.72

0.52 - 1.01

-

-

-

-

-

-

MBRN data

0.83

0.58 - 1.18

1.07

0.72 - 1.59

1.05

0.68 - 1.63

0.82

0.61 - 1.10

Cross-validated data

0.79

0.57 - 1.09

-

-

-

-

-

-

Tveit et al. BMC Pregnancy and Childbirth 2010 10:49   doi:10.1186/1471-2393-10-49