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Table 4 Age-adjusted&odds ratio (OR) for potential predictors of obstetric haemorrhage for different lookback periods

From: Use of hospitalisation history (lookback) to determine prevalence of chronic diseases: impact on modelling of risk factors for haemorrhage in pregnancy

   Type of diseases Lookback periods:     
  'Birth' 'Pregnancy' '2 years' '3 years' '4 years' '5 years'
Cardiac diseases       
   OR (95% CI) 1.55
(1.03-2.33) 		1.45
(1.02-2.07) 		1.42
(1.04-1.93) 		1.34
(0.99-1.81) 		1.28
(0.95-1.72) 		1.21
(0.90-1.63)
   P value 0.04 0.04 0.03 0.06 0.11 0.21
Chronic renal disease       
   OR (95% CI) 3.00
(1.71-5.26) 		1.68
(1.16-2.45) 		1.58
(1.13-2.22) 		1.49
(1.08-2.06) 		1.45
(1.07-1.99) 		1.42
(1.05-1.92)
   P value <0.001 0.007 0.008 0.02 0.02 0.02
Psychiatric disorders       
   OR (95% CI) 1.67
(1.22-2.27) 		1.50
(1.13-1.98) 		1.36
(1.07-1.73) 		1.30
(1.03-1.63) 		1.28
(1.02-1.59) 		1.24
(1.00-1.54)
   P value 0.001 0.005 0.01 0.03 0.03 0.05
Pre-existing hypertension       
   OR (95% CI) 1.22
(0.90-1.65) 		1.18
(0.89-1.55) 		1.17
(0.89-1.54) 		1.16
(0.88-1.52) 		1.15
(0.87-1.51) 		1.14
(0.87-1.50)
   P value 0.20 0.25 0.25 0.28 0.32 0.35
Pre-existing diabetes       
   OR (95% CI) 1.06
(0.70-1.60) 		1.12
(0.76-1.66) 		1.10
(0.76-1.61) 		1.15
(0.80-1.66) 		1.14
(0.79-1.64) 		1.12
(0.77-1.61)
   P value 0.79 0.52 0.61 0.46 0.49 0.56
Asthma/COPD*       
   OR (95% CI) 1.22
(0.92-1.63) 		1.20
(0.94-1.53) 		1.19
(0.98-1.46) 		1.16
(0.95-1.41) 		1.13
(0.94-1.37) 		1.09
(0.90-1.31)
   P value 0.18 0.15 0.09 0.14 0.20 0.37
Thyroid disorders       
   OR (95% CI) 1.38
(0.88-2.16) 		1.39
(0.92-2.10) 		1.41
(0.97-2.06) 		1.38
(0.95-2.00) 		1.39
(0.97-2.00) 		1.34
(0.93-1.92)
   P value 0.16 0.12 0.07 0.09 0.07 0.11
Autoimmune diseases^       
   OR (95% CI) 1.34
(0.88-2.04) 		1.31
(0.89-1.92) 		1.23
(0.87-1.73) 		1.17
(0.84-1.62) 		1.23
(0.90-1.68) 		1.24
(0.92-1.67)
   P value 0.17 0.17 0.24 0.35 0.19 0.17
  1. & Age was divided into three groups: 15-19, 20-34 and ≥35 and treated as a categorical variable in the analyses.
  2. * Chronic obstructive pulmonary disease
  3. ^ Include Crohn's disease, ulcerative colitis, lupus, idiopathic, thrombocytopenic purpura, multiple sclerosis, psoriasis, autoimmune thyroiditis, rheumatoid diseases, Coeliac disease, vasculitis, pernicious anemia, myasthenia gravis, autoimmune hepatitis, ankylosing spondylitis, polymyositis and primary biliary cirrhosis
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BMC Medical Research Methodology

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