Two year consultation and prescription prevalence per 1,000 persons at each survey point in CiPCA comparison population and NorStOP responders.

NorStOP = North Staffordshire Osteoarthritis Project; CiPCA = Consultations in Primary Care Archive; COPD = Chronic obstructive pulmonary disease; URTI = Upper respiratory tract infection; NSAID = Non-steroidal anti-inflammatory drug; CI = Confidence interval.a Consultation and prescriptions for the 2 years prior to baseline survey for NorStOP baseline responders; for CiPCA comparison population time period 2001–2002.b Consultation and prescriptions for the 2 years before 3-year follow-up survey for NorStOP 3-year responders; for CiPCA comparison population time period 2004–2005.c Consultation and prescriptions for the 2 years before 6-year follow-up survey for NorStOP 6-year responders; for CiPCA comparison population time period 2007–2008.