The selection criterion of being disease free on three consecutive screenings, however, and the finding that the screening attendance after the third negative result was similar in both groups make such a bias unlikely.
This article describes the results of three consecutive screenings in the urban population of Monterrey, Mexico.
After three consecutive screenings, we isolated 39 clones that gave rise to a much stronger signal with the NPA probe than with the HTC 2 probe.
There were 14,554 patients who completed two consecutive annual screenings with gradable photographs showing no DR (R0M0) or mild NPDR (R1M0) who had at least one further episode with gradable photographs.
Three consecutive cardiovascular screenings (screenings I, II, and III) in the three Norwegian counties Oppland, Sogn og Fjordane, and Finnmark, were carried out in 1974 78, 1977 83, and 1985 88, respectively (Fig. 1).
We report in this study on 14,554 patients with assessable images showing either no DR (R0M0) or only mild NPDR (R1M0) in one or both eyes at two consecutive annual screenings (hereafter referred to as baseline) and in whom there was at least one further follow-up screening episode (Fig. 1).
The Norwegian Counties Study is a prospective cohort study comprising three consecutive cardiovascular screenings performed between 1974 and 1988 in three Norwegian counties including over 90,000 individuals.
From 2005, 14,554 patients with no DR or mild nonproliferative DR only at two consecutive annual digital photographic screenings were categorized by the presence of DR in neither, one, or both eyes at each screening and were followed for a further median 2.8 years.
