Study populations varied in age distribution.
Previous global studies have found that cancer incidence and mortality vary according to age distribution, sex, location and economic status of a country [ 1, 2].
The characteristics of the control groups differed; they were selected in different ways during different time frames, showed varying degree of participation, and varied in sex and age distribution.
Although the precise age distribution varied by case (see Fig. 3), the overall distribution was normal with a modal age of 14 years (see Fig. 4).
The age distribution varied from 26 years to 95 years (mean: 68.9 years).
The estimated risk of PHN varied by study design, age distribution of study populations and definitions used for PHN.
Age distribution varied greatly between studies, as did the site and type of fracture covered by the study.
The age distribution varied geographically, with London having more infections in young adults and less in people older than 40 years (figure 1F).
The age distribution varied considerably by payer type, which may reflect the rising illness rates across age groups, the effect (for Medicaid in particular) of eligibility based on pregnancy, and the preponderance of people over age 65 in Medicare based on age-related eligibility.
The age distribution varied by cancer type: median age was 37 years for KS (range: 19 68), 33 years for NHL (21 68), 35 years for ICC (37 48), 42 years for anal cancer (34 55), 39 years for lung cancer (23 68), 50 years for non-melanomatous skin cancer (36 69), 31 years for brain cancer (28 58), 32 years for HD (19 43), and 32 years for leukaemias (21 67).
Adults outnumber juveniles in most populations, but gauging the ratios is difficult because juveniles are harder to catch; with current sampling methods, estimates of age distribution vary widely.
