This led to a recommendation for an eight year screening interval for men with concentrations <1 µg/L.
The second outcome was the longitudinal predictive value derived from registry linkage and other prospective studies that would support the applicability of the AHPV test in primary screening with at least a three year screening interval.
25 A study of the Swedish screening programme used a three year screening interval in a cohort of well controlled participants (mean HbA1c6.4%% at baseline) with type 2 diabetes mellitus, who showed no evidence of retinopathy and had a mean known duration of diabetes of six years.
The date of entry into the study for the people in the screening group was the date of the screening appointment, evenly distributed throughout the two year screening period (January 1999 to December 2000) by central, random allocation.
1) Also a part of women age 40-59 go to mammography screening at a two year interval.
Overall, cervical screening participation rates were consistent with relevant administrative statistics, with around 60% of women having been screened over a two year period.
In a large study of screening for colorectal cancer using flexible sigmoidoscopy carried out in Norway during 1999-2001, 6 appointments were randomly allocated to 20 780 adults throughout the three year screening period.
The Dutch trial of a systematic approach to screening using the Internet, showed insufficient levels of uptake sustained over the three year screening period to reduce chlamydia prevalence [ 7].
Uptake rates were calculated as the total number of women who attended during this period (plus a 6 month slippage time to allow for delayed attendance), divided by the total number of women invited during the three year screening cycle.
9 10 11 At the same time, the absolute difference in the cumulative rate of CIN 3 or AIS detection in women aged 35 years or older increased only slightly within the five year screening interval.
We aimed to assess the expected lifetime costs and benefits of four abdominal aortic aneurysm screening strategies from the perspective of a national health service: no screening, once per lifetime screening, twice per lifetime screening with a five year interval, and lifetime screening every five years.
