Table 3

Associations between potential risk factors in 1969 and low back pain 1969, in 1979–92, and in 1993; age adjusted and weighted analyses by sex

Potential risk factorsLow back pain in 1969Low back pain in 1970–92Low back pain in 1993
Actual study group PREstimated full study group weighted PRActual study group CIREstimated full study group weighted CIRActual study group PREstimated full study group weighted PR
Exposure HealthExposure +healthExposureHealthExposure +healthExposure HealthExposure +health
Women:
 Heavy physical load1.41.41.41.41.11.11.21.11.00.91.01.0
 High mental load0.81.11.01.11.41.21.41.41.10.91.11.1
 Monotonous work1.61.51.61.71.11.31.11.20.90.90.80.9
Men:
 Heavy physical load1.41.31.31.41.41.51.51.41.11.31.21.2
 High mental load1.21.21.31.31.01.01.00.91.11.01.01.0
 Vibrations0.90.90.90.91.41.41.31.41.31.51.41.4
 Monotonous work0.80.70.90.91.01.00.90.91.51.61.41.4
  • PR=prevalence ratio, adjusted for age; CIR=cumulative incidence ratio, adjusted for age.