Poorer self assessed health in a prospective study of men with screen detected abdominal aortic aneurysm: a predictor or a consequence of screening outcome?

STUDY
OBJECTIVES: To assess the extent to which poorer self assessed health in men in whom an abdominal aortic aneurysm (AAA) is detected at screening is a consequence or a predictor of screening outcome.
DESIGN: Prospective study.
SETTING: Community based screening. PARTICIPANTS: 23 654 men who attended for AAA screening as part of the UK multicentre aneurysm screening study completed a measure of self assessed health before screening. A total of 1156 had an aneurysm detected. A sub-sample of screened men (571 with an aneurysm and 609 with a normal aorta) also completed the measure of self assessed health six weeks after screening. MAIN
RESULTS: Men in whom an aneurysm was detected at screening perceived their health to be poorer before screening than those with a normal aorta. Adjusting for risk factors for AAA made no difference to this RESULT: self assessed health remained a strong predictor of having an aneurysm (odds ratio 1.7 comparing the extreme quartiles of self assessed health, 95% confidence intervals: 1.4 to 2.0). Men with an aneurysm also perceived their health to be poorer after screening had detected their aneurysms, but only to an extent in line with their pre-screening perceptions.
CONCLUSIONS: Self assessed health seems to predict having an aortic aneurysm, independently of known risk factors. This emphasises the importance of assessing baseline perceptions of health to prevent erroneously inferring that poorer self assessed health in those who screen positive is a consequence as compared with a predictor of screening outcome.