Count and rate estimates for England
Numbers of diagnostic episodes of chlamydia and gonorrhoea
within the CPRD population were calculated.
Overall and annual age-standardised and genderstandardised
diagnosis counts and rates (per 100 000
population) with 95% CIs were then estimated for all
GPs in England, using English population estimates.28
Diagnosis counts and rates of chlamydia and gonorrhoea
in GUM clinics and, for chlamydia, through the
NCSP (excluding GP), were calculated.
Population count and rate estimates in GP were then
expressed as a percentage of total diagnoses and rates in
England. We assumed that all diagnoses made in GP
represented the first patient attendance for care, and that
all non-treated episodes had been referred to a specialist