There was no significant change in the number of SRCs in the adult population diagnosed over time, which helps support our hypothesis, as the law does not apply to the adult population.
When comparing survival across different cohorts diagnosed over time, we would expect the later cohorts to demonstrate a shift in survival, thus violating any observed linear relationships between earlier quantiles and later quantiles observed in the past.
In an analysis in the Lancet Neurology journal, Brayne and colleagues assessed the findings of five more recent large studies carried out in Sweden, the Netherlands, the UK and Spain that all compare the numbers of people with dementia and those being diagnosed over two different points in time.
Patient demographics, completeness of surgery, and initial cancer stage have not changed significantly in our study cohort (Table 1), however, there has been a marked change in the relative proportion of various types of thyroid cancer diagnosed over this time period.
Studies from Finland [ 3] and Norway [ 4, 5] demonstrate reduced fertility in the YAS population as compared to the general population or matched controls, however these studies include patients diagnosed over a long time period (as early as 1953 [ 3]) and reflect treatment regimens that have changed over time.
Patients were diagnosed over a longer time period at different institutions and consequently not uniformly treated.
Diagnostic classification changed considerably over the period in which the studies were conducted given the fact that patients had been diagnosed over a wide time period ranging from 1920 to 2010.
Considering the whole period from 1973 to 2009, the annual number of cases diagnosed increased over time except for a temporary drop during the period 1995 to 1997.
Cases included in the analysis were diagnosed over a seven year time frame, immediately before the conduction of the study.
To date the largest breast-ACC studies [ 14, 22- 27, 27, 30, 32, 36, 41], including one population-based study [ 28], have each included fewer than 40 cases, with some studies including cases diagnosed over a ≥40-year time period [ 23, 24, 30].
In general, the diagnostic precision of psychiatric diagnoses has increased over time as DSM has made its mark on psychiatry, and diagnostic criteria were introduced in ICD.
