Table 1.
Characteristics of the subjects (n = 15, 8 women and 7 men).
Fig 1.
Schematic representation of the low back PPT recording grid of the left (blank square) and right (black squares) erector spinae muscles.
The spinal processes of first (L1) to fifth (L5) vertebrae are represented by black crosses.
Table 2.
Intraclass correlation coefficients (ICC), standard error of measurement (SEM) and minimum detectable change (MDC) for pressure pain thresholds assessed during session 1 over 14 locations (P1 to P14) over the low back region, for left and right locations (Pleft and Pright) as well as overall low back (Pall) between the mean of the first and second trials (T1-T2), the first and the third trials (T1-T3), the second and the third trials (T2-T3) and the means of the three trials (T1-T2-T3).
Table 3.
Mean (SD) pressure pain thresholds (kPa) for session 1 assessed over 14 locations covering the low back region and level of significance (p-values) among trial.
See “Procedure to mark the 14 anatomical locations” for explanation concerning the locations of PPT assessments.
Fig 2.
Inter-session ICC values of the left, right and all locations depending on the number of successive trials considered.
Table 4.
Mean (±SD); Standard Error of Measurement (SEM); Minimal Detectable Change (MDC); Intraclass Correlation Coefficient (ICC), 95% Confidence Interval (CI) of ICC, and 95% Limits of Agreement (LoA) for Pressure Pain Threshold (PPT) among 14 lumbar locations, left locations (Pleft), right locations (Pright) point and all the locations (Pall) when 1,2 or 3 trials during session 1 and session 2 are compared.
Fig 3.
Bland and Altman analyses plotted for worker’s pressure pain threshold of the overall low back for the mean of the first trials (A), the first and second trials (B) and the three trials(C).
Fig 4.
Limits of Agreement (LoA) values of left, right and the overall back locations are averaged to calculate PPTs measurements.
Table 5.
Comparison of means of ICCs values regardless of the conducted comparisons between trials.
Table 6.
Comparison of means of SEMs values regardless of the conducted comparisons between trials.