Low back trouble in a general population of 30-, 40-, 50-, and 60-year-old men and women. Study design, representativeness and basic results.
D000328:Adult; D000367:Age Factors; D000368:Aged; D001416:Back Pain / Q000453:epidemiology*; D003718:Denmark; D005260:Female; D006306:Health Surveys; D006801:Humans; D008297:Male; D008875:Middle Aged; D010358:Patient Participation; D012107:Research Design