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Table 3 Correlation matrix between the eight constructed variables of low back pain (LBP) in Dphacto, N = 842 (p < 0.001)

From: Low back pain patterns over one year among 842 workers in the DPhacto study and predictors for chronicity based on repetitive measurements

 

Accumulated LBP

Mean LBP

Median LBP

LBP >2

LBP >4

LBP =0

Standard Deviation

Variation span

Accumulated LBP

1

-

-

-

-

-

-

-

Mean LBP

0.99

1

-

-

-

-

-

-

Median LBP

0.97

0.98

1

-

-

-

-

-

LBP > 2

0.94

0.93

0.91

1

-

-

-

-

LBP > 4

0.92

0.92

0.89

0.81

1

-

-

-

LBP = 0

−0.81

−0.81

−0.79

−0.80

−0.57

1

-

-

Standard deviation

0.42

0.42

0.31

0.38

0.32

−0.42

1

-

Variation span

0.43

0.43

0.33

0.40

0.32

−0.46

0.96

1

  1. Analysed with Pearson correlation. LBP = low back pain. The eight LBP variables are constructed for all blue- and white-collar workers included from the DPhacto study. Accumulated LBP: summation of all LBP intensity scores for each worker, mean LBP: the mean of all LBP intensity scores, median LBP: the median of all LBP intensity scores, LBP > 2: number of months with LBP assessments higher than 2, LBP > 4: number of months with LBP assessments higher than 4, LBP = 0: number of months with LBP assessments equal to 0, standard deviation of all LBP intensity scores, and the variation span: numeric difference between the workers highest and lowest pain intensity scores. Coefficients are shown between all eight LBP variables with p < 0.001