Over 10 to 14 years of follow - up, they documented 634 cases of coronary heart disease, which they matched with control subjects for age, smoking status and the date blood was drawn. (scientificamerican.com)
My shop is a mix of different subjects for all age groups in primary school... almost like a pick»n' mix of resources! (tes.com)
By stripping back the number of externally - assessed subjects for this age... (schoolsweek.co.uk)