Nigeria, representing 25.7% of the study population, contributed 44.1% of the sample's ophthalmic nurses.
The study population contributed a total of 26.5 million person-years of observation between January 1 , 2002and December 31 , 2011
Each man in the study population contributed person time from the date of the first screening test until date of diagnosis, emigration from the study area, death or end of study period (31 December 2004), whichever came first.
Each man in the study population contributed person time from the date of the randomisation until the date of prostate cancer diagnosis, emigration, death or end of study (31 December2009), whichever came first.
However, the small number of inferior Q waves noted in the study population contributed to very wide confidence intervals and precludes a reliable conclusion about the differential impact of Q waves across territories.
In addition, we analysed magnesium from supplemental sources using tertile categories because intake of supplemental magnesium was low in this study population (contributing to <8% of total magnesium).
The large study population contributes to underpin an area almost not studied and documented in this population.
In addition, the youth of our study population contributes significant information to existing literature because it evaluates alcohol effects on CVD risk, with minimal confounding.
The low frequency of the Ala allele in our study population contributes to a wider range of 95% CIs in OR estimations and limits the statistical power for stratified analyses.
There were 2 063 421 children in our study population, contributing a total of 10 508 374 person-years.
OR defined the study population and contributed data.
