Remembering fractures: fracture registration and proband recall in southern Sweden.

pleted the baseline interview, and 90% or more of these completed each of the follow up interviews. In the 3724 person-months during which subjects had "outdoor exposure", 155 falls were reported. The incidence rates of indoor and outdoor falls were 21-2 and 20-4 falls per 1000 person-months, respectively. The table shows that the risk factors differed for indoor and outdoor falls. Our results, if con- firmed, suggest that indoor and outdoor falls should be studied as separate outcomes. This distinction might eventually prove useful for the design of preventive interventions.