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Table 3 Incidence rates based on different denominators

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

Incidence rate /1,000 Numerator: All new episodes in 2012 All new episodes in 2012 All new episodes in 2012 Difference person-years at-risk – person-years Difference person-years at-risk – population on 1 July Difference person-years – population on 1 July
Denominator: Person-years at–riska Person-yearsb Population on 1 Julyc
Long-lasting diagnosis* ICPC Mean Mean Mean Mean (%) Mean (%) Mean (%)
Contact dermatitis/ allergic eczema S88 34.78 33.83 34.28 0.95 (2.8%) 0.50 (1.4%) -0.45 (-1.3%)
Hayfever/allergic rhinitis R97 24.14 23.43 23.74 0.70 (3.0%) 0.39 (1.7%) -0.31 (-1.3%)
Constipation D12 20.75 20.36 20.63 0.39 (1.9%) 0.11 (0.6%) -0.27 (-1.3%)
Naevus/mole S82 16.11 15.96 16.17 0.15 (0.9%) -0.06 (-0.8%) -0.21 (-1.3%)
Lumbar disc lesion, back pain with radiating pain L86 15.13 14.92 15.12 0.21 (1.4%) 0.01 (0.1%) -0.20 (-1.3%)
Vitamin deficiency/other nutritional disorder T91 12.90 12.74 12.91 0.16 (1.2%) -0.01 (-0.1%) -0.17 (-1.3%)
Shoulder syndrome L92 11.97 11.86 12.01 0.11 (0.9%) -0.05 (-0.4%) -0.16 (-1.3%)
Depressive disorder P76 10.70 10.51 10.65 0.20 (1.9%) 0.06 (0.5%) -0.14 (-1.3%)
Allergy/allergic reaction A12 10.28 10.19 10.33 0.09 (0.9%) -0.05 (-0.4%) -0.14 (-1.3%)
Cataract F92 9.83 9.76 9.89 0.07 (0.7%) -0.06 (-0.6%) -0.13 (-1.3%)
Chronic diagnosis* ICPC       
Uncomplicated hypertension K86 12.59 10.96 11.11 1.63 (14.8%) 1.48 (13.3%) -0.15 (-1.3%)
Atopic dermatitis/other eczema S87 11.75 10.91 11.06 0.84 (7.7%) 0.69 (6.3%) -0.15 (-1.3%)
Lipid metabolism disorder T93 8.50 7.97 8.08 0.52 (6.5%) 0.42 (5.1%) -0.11 (-1.3%)
Asthma R96 8.14 7.49 7.59 0.65 (8.7%) 0.55 (7.2%) -0.10 (-1.3%)
Refractive errors F91 4.99 4.88 4.95 0.10 (2.1%) 0.04 (0.1%) -0.06 (-1.3%)
Diabetes mellitus T90 4.78 4.50 4.56 0.28 (6.3%) 0.22 (4.9%) -0.06 (-1.3%)
Acquired deformity of limbs L98 4.39 4.27 4.33 0.12 (2.8%) 0.06 (1.5%) -0.06 (-1.3%)
Atherosclerosis (excl. K76,K90) K91 4.18 4.15 4.20 0.04 (0.9%) -0.02 (-0.5%) -0.06 (-1.3%)
Malignant neoplasm of skin S77 3.82 3.74 3.78 0.09 (2.3%) 0.04 (1.0%) -0.05 (-1.3%)
Osteoarthritis knee L90 3.72 3.63 3.68 0.09 (2.6%) 0.04 (1.2%) -0.05 (-1.3%)
  1. *The ten highest incident long-lasting and chronic diagnoses are displayed
  2. aNumber is per 1,000 person-years at-risk, bNumber is per 1,000 person-years, cNumber is per 1,000 persons