Sensitivity analysis
The bias-corrected RRs, with simultaneous corrections for both exposure misclassification and unmeasured confounding, revealed the risk of perinatal mortality in chronic hypertensive pregnancies was almost five-fold higher (RRbc 4.86, 95% CI 3.42, 5.98), compared to normotensive pregnancies. The risk was highest for stillbirth in relation to chronic hypertension (RRbc7.76, 95% CI 4.52, 11.12).