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 | Â | Â | Â | Â | Â | Â |
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%) |