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

BMC Public Health

Table 2 Characteristics of the Study Population

	Number of cases (n)	Percentage (%)
Population characteristics
Patients	1,223,818
Person-years	1,145,726
Gender
Male	603,179	49.3
Female	620,639	50.7
Age^a (year)
0–4	63,969	5.2
5–17	190,197	15.5
18–44	432,438	35.3
45–64	338,904	27.7
65–74	111,286	9.1
75–84	62,395	5.1
≥ 85	24,629	2.0
General practice characteristics
Number	312
Patients (mean ± SD)	3923 ± 2449
Person-years (mean ± SD)	3672 ± 2289
Mode of practice^b
Solo	133	42.6
Duo	79	25.3
Group	76	24.4
Unknown	24	7.7
Degree of urbanization^c
Extremely urbanised	65	20.8
Strongly urbanised	71	22.8
Moderately urbanised	57	18.3
Hardly urbanised	60	19.2
Not urbanised	48	15.4
Unknown	11	3.5

^aThe age of patients on the last day of the year was used for the total population
^bIn a solo practice, one GP is working. In a duo practice two GPs are employed and in a group practice three or more GPs are engaged with the practice
^cExtremely urbanized comprised of ≥2500 addresses/ km²; strongly urbanized of ≥1500–2500 addresses/ km²; moderately urbanised of ≥1000–1500 addresses/ km²; hardly urbanised of ≥500–1000 addresses/ km²; not urbanised of < 500 addresses/km²

ISSN: 1471-2458