Reproducibility of the history of low-back trouble.

摘要: The reproducibility of auto-anamnestic information concerning low back trouble (LBT) was analyzed in 6 and 12 months' follow-up studies a general population 30-, 40-, 50-, 60-year-old men women male hospital porters 20-68 years old. At an interval about months, the question ever having had LBT answered by yes/no ratio approximately 2 : 1, 84% consistently on two occasions. Affirmative or negative answers previous lumbar spine x-ray examination were contradicted at 1 year's 11%. After two-fifths subjects reproduced their statement age onset ± year. cumulative incidence curves estimated varied systematically between 30 old 60 old, suggesting forgetful behavior. annual risk first time experience seemingly fourfold higher during year than 7 preceding years. This feature also can be explained forgetfulness. caution with which data obtained means subjective statements should handled is stressed, together significant influence that different methods collection tend to have results.