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Table 3 Cumulative frequency and relative frequency of cases ascertained at different lookback periods and the prevalence of diseases for the 53,438 women by disease type

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

  Lookback period:     
  'Birth' 'Pregnancy' '2 years' '3 years' '4 years' '5 years'
Cardiac diseases       
   No. 194 273 357 392 425 445
   % of total cases 43.6% 61.3% 80.2% 88.1% 95.5% 100.0%
   Prevalence 0.36% 0.51% 0.67% 0.73% 0.80% 0.83%
Chronic renal disease       
   No. 67 217 279 324 354 377
   % of total cases 17.8% 57.6% 74.0% 85.9% 93.9% 100.0%
   Prevalence 0.13% 0.41% 0.52% 0.61% 0.66% 0.71%
Asthma/COPD*       
   No. 473 682 984 1,087 1,175 1,255
   % of total cases 37.7% 54.3% 78.4% 86.6% 93.6% 100.0%
   Prevalence 0.89% 1.28% 1.84% 2.03% 2.20% 2.35%
Psychiatric disorders       
   No. 325 424 619 705 783 829
   % of total cases 39.2% 51.1% 74.7% 85.0% 94.5% 100.0%
   Prevalence 0.61% 0.79% 1.16% 1.32% 1.47% 1.55%
Pre-existing hypertension       
   No. 420 515 535 540 546 549
   % of total cases 76.5% 93.8% 97.4% 98.4% 99.5% 100.0%
   Prevalence 0.79% 0.96% 1.00% 1.01% 1.02% 1.03%
Pre-existing diabetes       
   No. 250 265 289 297 300 305
   % of total cases 82.0% 86.9% 94.8% 97.4% 98.4% 100.0%
   Prevalence 0.47% 0.50% 0.54% 0.56% 0.56% 0.57%
Thyroid disorders       
   No. 173 204 240 253 266 275
   % of total cases 62.9% 74.2% 87.3% 92.0% 96.7% 100.0%
   Prevalence 0.32% 0.38% 0.45% 0.47% 0.50% 0.51%
Autoimmune diseases^       
   No. 202 247 323 374 401 426
   % of total cases 47.4% 58.0% 75.8% 87.8% 94.1% 100.0%
   Prevalence 0.38% 0.46% 0.60% 0.70% 0.75% 0.80%
  1. * Chronic obstructive pulmonary disease
  2. ^ 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