Sample characteristics at baseline by occurrence of a subsequent composite cardiovascular outcome.

*Univariable hazard ratios, 95% confidence intervals and P values were derived from a survival model, censoring on death; missing baseline data were either imputed from responses on the year 1 follow-up assessment or incorporated as a ‘missing’ dummy variable. Hazard ratios >1 indicate lower mortality in reference category.†Hazard ratio is per additional comorbid condition.‡Hazard ratios are per doubling of the number of visits in the pre-baseline year.§Hazard ratios are per 10-point increase in WOMAC subscale score.