The declining trend over a mean interval of three years is also matching findings in these previous studies.
In addition, persistence of DTCs after a median relapse-free follow-up interval of three years indicated an elevated risk of relapse [ 4, 5].
With a coverage interval of three years and a follow-up of five years, however, it could be as much as eight years between the last screen and a diagnosis of cancer.
A time interval of three years has been used for a multitude of previous studies [ 13, 15, 16], and this interval was hence selected for all analysis presented in this report.
Because these data were derived from a region where and at a time when three yearly screening was recommended for all ages, we applied these probabilities only to women with a recommended screening interval of three years (ages 25-49 years). 25-49 years
Our accuracy was slightly less favorable than Eaton-Evans and Dugdale with a recall interval of three years (79%and95%5% correct recall within one and two months, respectively) [ 9], but better than the one reported by Tienboon (35% and 59%, respectively) [ 16] after an interval of 15 years.
The Government of Bangladesh recommends an interval of three years between the last live birth and the next attempt to get pregnant, which corresponds to a birth-to-birth interval of 45 months under the assumption of nine months gestation [ 8].
Although the consistency of results from seven schools in different geographic and socioeconomic environments with a time interval of three years lends confidence to the findings, the data were based entirely on anonymous self-completed questionnaires and thus subject to responder bias.
Considering the interval of three years, these figures are still rather consistent, and conform to suggestions that about half of children diagnosed with AD/HD seem to grow out of it, at least in the sense that they no longer meet the diagnostic criteria for this particular condition [ 24], or that key AD/HD features may transform into other mental health problems [ 4, 25].
