For Asian patients, screening prevalence did not change significantly over the 3 periods; for Black patients, screening prevalence increased over the 3 periods (Table 3).
As far as descriptive analysis is concerned, we reported the detection rate at first screen (prevalence) for colorectal adenoma and CRC.
In this population-based sample of rural and urban women from the Kilimanjaro Region, Tanzania, the prevalence of screening for cervical cancer was extremely low at 6%, in close agreement with the 5-year screening prevalence estimated for developing countries by the WHO (5%).
For patients with known risk factors for HBV infection, screening prevalence increased over the 3 periods.
Under-estimating screening prevalence or over-estimating screening inequalities could lead to wasted resources, and conversely, over-estimating screening prevalence or under-estimating screening inequalities could lead to missed opportunities for improving screening.
Parallel sex differentials were observed in the distribution of certain morbidity conditions in the Bangladesh Demographic and Health Survey (BDHS) 2011, which screened for prevalence of hypertension and diabetes in women and men aged 35 and older (2).
When assessing the effect of ever having been screened, the major driver of this bias is prevalence screening, and for a mature programme with approximately 6 incidence screens for each prevalence screen, this bias is likely to be small.
Thus there is a need for screening its prevalence in general population of adolescents.
In a prospective cohort study in patients with established vascular disease or type 2 diabetes, 1.5 years after referral to the hospital and even after participation in a risk factor screening programme, prevalences were 43% for hypertension, 40% for hypercholesterolaemia, 24% for obesity, and 19% for smoking.
