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Table 4 Comparison of prevalence proportions calculated with different methods

From: Calculating incidence rates and prevalence proportions: not as simple as it seems

Prevalence proportion /1.000 1 year period prevalencea Point prevalenceb Contact prevalencea  
  Numerator: Existing episodes in 2012 Existing episodes on 31 Dec 2012 Number of persons with ≥1 contact in 2012 Difference 1 year period prevalence point prevalence Difference 1 year period prevalence contact prevalence Difference point prevalence contact prevalence
Denominator: Person-years Population on 31 Dec 2012 Person-years
Long-lasting diagnosisc ICPC Mean Mean Mean Mean (%) Mean (%) Mean (%)
Contact dermatitis/ allergic eczema S88 58.41 24.68 41.31 33.72 (136.6%) 17.09 (41.4%) −16.63 (−40.3%)
Hayfever/allergic rhinitis R97 47.96 21.77 35.28 26.19 (120.3%) 12.68 (35.9%) −13.51 (−38.3%)
Constipation D12 37.94 18.28 25.57 19.66 (107.5%) 12.37 (48.4%) −7.29 (−28.5%)
Lumbar disc lesion. Back pain with radiating pain L86 28.31 13.63 20.50 14.68 (107.7%) 7.81 (38.1%) −6.87 (−33.5%)
Depressive disorder P76 28.25 17.84 21.62 10.41 (58.3%) 6.62 (30.6%) −3.78 (−17.5%)
Naevus/mole S82 24.73 9.51 17.04 15.22 (160.1%) 7.69 (45.1%) −7.53 (−44.2%)
Vitamin deficiency/other nutritional disorder T91 22.33 12.55 17.70 9.78 (77.9%) 4.64 (26.2%) −5.14 (−39.1%)
Shoulder syndrome L92 20.81 8.79 14.62 12.02 (136.7%) 6.19 (42.4%) −5.83 (−39.9%)
Tobacco abuse P17 18.52 6.04 10.30 12.48 (206.6%) 8.21 (79.7%) −4.26 (−41.4%)
Allergy/allergic reaction A12 18.47 8.13 12.31 12.31 (127.2%) 6.16 (50.0%) −4.18 (−34.0%)
Chronic diagnosisc ICPC  
Uncomplicated hypertension K86 139.92 144.96 94.78 −5.04 (−3.5%) 45.14 (47.6%) 50.18 (52.9%)
Asthma R96 87.46 90.60 39.23 −3.15 (− 3.5%) 48.23 (122.9%) 51.37 (130.9%)
Atopic dermatitis/other eczema S87 79.82 82.68 23.77 −2.86 (−3.5%) 56.05 (235.8%) 58.91 (247.8%)
Lipid metabolism disorder T93 67.81 70.25 30.41 −2.44 (−3.5%) 37.40 (123.0%) 39.84 (131.0%)
Diabetes mellitus T90 64.12 66.43 55.70 −2.32 (−3.5%) 8.41 (15.1%) 10.73 (19.3%)
Acquired deformity of limbs L98 31.07 32.18 5.99 −1.11 (−3.5%) 25.07 (418.4%) 26.19 (436.9%)
Emphysema/chronic obstructive pulmonary disease R95 29.72 30.79 20.47 −1.07 (−3.5%) 9.25 (45.2%) 10.32 (50.4%)
Osteoarthritis knee L90 27.90 28.91 9.64 −1.00 (−3.5%) 18.26 (189.4%) 19.26 (199.8%)
Malignant neoplasm of skin S77 25.71 26.64 8.98 −0.92 (−3.5%) 16.73 (186.3%) 17.66 (196.6%)
Angina pectoris K74 25.39 26.30 12.31 −0.91 (−3.5%) 13.08 (106.3%) 14.00 (113.7%)
  1. aNumber is per 1000 person-years, bNumber is per 1000 persons
  2. cThe ten highest prevalent long-lasting and chronic diagnosis are displayed