HOW COMMON IS LOW-BACK-PAIN IN THE NORDIC POPULATION - DATA FROM A RECENT STUDY ON A MIDDLE-AGED GENERAL DANISH POPULATION AND 4 SURVEYS PREVIOUSLY CONDUCTED IN THE NORDIC COUNTRIES

Study Design. Data were obtained in a Danish cross-sectional postal su rvey and compared with information from four methodologically similar studies conducted in some of the Nordic countries between 1977-1985. O bjectives. The objectives were to estimate the life-time cumulative in cidence and the 1-year period prevalence of low back pain in the gener al population, to study whether there are any differences in the occur rence of low back pain according to age and sex, and to investigate wh ether low back pain is on the increase. Summary of Background Data. Th e prevalence of low back pain commonly is thought to be high, but esti mates differ considerably between studies. It is also not known whethe r low back pain is more common in men or women or in certain age group s, and it is unclear whether the prevalence of low back pain has incre ased in the past years. Methods. Prevalence estimates were established in a current study, and results then were adjusted to suit the age an d sex criteria of four previous studies.Results. Between 60-65% of 30- to 50-year-old men and women living in the Nordic countries reported at least one incidence of low back pain during their lifetime, based o n the information from four studies with a total sample size of 3513. The most likely 1-year period prevalence estimate is between 44-54%, b ased on two studies and a total sample of 2035 individuals. There was no consistent evidence favoring higher figures with increasing age or relating to any of the genders. No clearly observed time-related trend was noted. Conclusions. When data were examined from five methodologi cally similar studies on the 30- to 50-year-old Nordic population, the re was reasonable consistency of prevalence figures. Thus, approximate ly 66% report having had low back pain at least sometime during their lifetime and approximately 50% sometime during the preceding year, wit h no significant differences relating to age or sex. The best method t o investigate whether low back pain is on the increase might be throug h replicate studies.