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Table 4 Correlations between the variables lifting low, overhead lifting, carrying, standing forward bend, overhead working and ICF variables

From: Construct validity of functional capacity tests in healthy workers

Ā Ā 

r, Ļ, r pbi

Functional capacity

Ā Ā Ā 

Material handling

Ā 

Static work

Ā 
Ā Ā Ā 

Lifting low

Overhead lifting

Carrying

Standing forward bend

Overhead working

Ā Ā Ā 

Total

ā™‚;ā™€

Total

ā™‚;ā™€

Total

ā™‚;ā™€

Total

ā™‚;ā™€

Total

ā™‚;ā™€

Ā 

Body function

Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā 

H1

ā€ƒMuscle power

Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā 
Ā 

ā€ƒā€ƒHandgrip strength (kg)

r

0.68**

0.29**;0.32**

0.72**

0.37; 0.35**

0.68**

0.30**;0.32**

āˆ’0.03

0.00; 0.02

0.26**

0.10; 0.22**

Ā 

ā€ƒā€ƒKnee flexion (N)

r

0.53**

0.25**;0.21**

0.52**

0.22**;0.22**

0.55**

0.26**;0.32**

āˆ’0.04

āˆ’0.02; 0.01

0.16**

0.06; 0.05

Ā 

ā€ƒā€ƒKnee extension (N)

r

0.49**

0.24**;0.27**

0.45**

0.17*; 0.21**

0.48**

0.19**;0.34**

0.03

0.04; 0.09

0.18**

0.11; 0.03

Ā 

ā€ƒā€ƒElbow flexion (N)

r

0.64**

0.26**;0.25**

0.66**

0.28**;0.30**

0.66**

0.29**;0.34**

āˆ’0.03

0.05; 0.00

0.15**

0.02; -0.01

Ā 

ā€ƒā€ƒElbow extension (N)

r

0.64**

0.37**;0.20**

0.66**

0.38**;0.26**

0.63**

0.35**;0.21**

āˆ’0.07

āˆ’0.04; -0.02

0.14**

0.01; -0.00

Ā 

ā€ƒā€ƒGlenohumeral abduction (N)

r

0.66**

0.31**;0.24

0.66**

0.38**;0.22*

0.70**

0.40**;0.34**

0.04

āˆ’0.09; 0.07

0.22**

0.10; -0.03

H2

ā€ƒAerobic capacity (ml/min/kg)

r

0.42**

0.21**;0.23**

0.40**

0.17*; 0.19*

0.43**

0.21**;0.23**

0.13**

0.10; 0.23**

0.28**

0.16; 0.03**

Ā 

Participation

Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā 

H3

ā€ƒā€ƒSport-indexā€ 

r

0.17**

0.18*; 0.20**

0.14**

0.11; 0.18*

0.16**

0.13; 0.23**

0.11*

0.07; 0.16

0.19**

0.14; 0.24**

H4

ā€ƒā€ƒLeisure time-indexā€ 

r

0.11*

0.03; 0.06

āˆ’0.12*

0.04; -0.00

āˆ’0.08

0.10; 0.05

0.04

āˆ’0.04; 0.09

0.09

0.14; 0.12

H5

ā€ƒā€ƒWork-indexā€ 

r

0.13*

0.10; 0.13

0.15**

0.14*; 0.12

0.13**

0.11; 0.12

0.07

0.09; 0.07

āˆ’0.02

āˆ’0.06; 0.00

Ā 

Environmental factors

Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā 

H6

ā€ƒPerception of work

Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā 
Ā 

ā€ƒā€ƒWorking pace||

r

0.01

āˆ’0.06; 0.01

0.00

āˆ’0.02; -0.01

āˆ’0.07

āˆ’0.17; -0.03

0.09

0.09; 0.09

āˆ’0.00

0.03; -0.06

Ā 

ā€ƒā€ƒEmotional work-load||

r

0.01

āˆ’0.08; 0.22**

āˆ’0.00

āˆ’0.09;0.18

āˆ’0.00

āˆ’0.09; 0.16

0.12*

0.01; 0.20**

0.10*

0.23; 0.22**

Ā 

ā€ƒā€ƒAlternation in work||

r

āˆ’0.06

āˆ’0.03; -0.19**

āˆ’0.02

0.00; -0.07

āˆ’0.06

āˆ’0.02; -0.18

āˆ’0.12*

āˆ’0.06; -0.18

āˆ’0.17**

āˆ’0.12; -0.25**

Ā 

ā€ƒā€ƒLearning possibilities||

r

0.01

āˆ’0.05; -0.04

0.04

0.02; -0.02

0.03

āˆ’0.01; -0.03

āˆ’0.10*

āˆ’0.14; -0.07

āˆ’0.14**

āˆ’0.09; -0.24**

Ā 

ā€ƒā€ƒSkill discretion||

r

0.00

0.02; -0.00

āˆ’0.03

0.01; -0.12

āˆ’0.01

0.02; -0.06

āˆ’0.07

āˆ’0.10; -0.04

āˆ’0.20**

āˆ’0.22**;-0.18

Ā 

ā€ƒā€ƒDecision authority||

r

0.00

0.01; -0.0

āˆ’0.05

0.03; 0.06

āˆ’0.06

0.03; 0.03

āˆ’0.07

āˆ’0.09; -0.07

āˆ’0.16**

āˆ’0.19**;-0.08

Ā 

ā€ƒā€ƒCo-worker support||

Ļ

āˆ’0.03

āˆ’0.02; -0.05

0.01

0.00; -0.03

āˆ’0.05

āˆ’0.16; -0.02

0.00

0.08; -0.07

āˆ’0.08

āˆ’0.01; 0.02

Ā 

ā€ƒā€ƒSupervisory support||

Ļ

0.02

āˆ’0.03; 0.09

0.04

āˆ’0.01; 0.05

0.05

0.00; 0.08

āˆ’0.01

āˆ’0.06; 0.05

āˆ’0.07

āˆ’0.13; -0.01

Ā 

ā€ƒā€ƒEmotional exhaustion||

r

āˆ’0.05

āˆ’0.07; 0.05

āˆ’0.04

āˆ’0.06; 0.07

āˆ’0.07

āˆ’0.13; 0.05

0.13*

0.08; 0.17

āˆ’0.01

āˆ’0.06; 0.08

Ā 

ā€ƒā€ƒWorrying||

Ļ

0.03

0.02; 0.04

0.04

0.04;0.05

0.02

āˆ’0.03; 0.05

0.07

0.08; 0.06

0.03

āˆ’0.01;0.07

Ā 

ā€ƒā€ƒJob task satisfaction||

r

0.05

0.03; 0.02

0.05

0.05; -0.02

0.04

0.00; 0.03

āˆ’0.08

āˆ’0.05; -0.08

āˆ’0.11*

āˆ’0.10; -0.16

Ā 

ā€ƒā€ƒCommitment to organization||

r

āˆ’0.08

āˆ’0.02; -0.07

āˆ’0.07

0.01; -0.08

āˆ’0.05

0.04; -0.06

āˆ’0.02

āˆ’0.04; -0.01

āˆ’0.03

āˆ’0.00; -0.04

Ā 

ā€ƒā€ƒPhysical load||

r

0.08

0.08; 0.03

0.09

0.12; 0.04

0.07

0.07; 0.02

0.04

0.03; 0.05

0.00

āˆ’0.03; 0.03

Ā 

ā€ƒā€ƒJob security||

Ļ

0.05

0.08; -0.06

0.03

āˆ’0.02; -0.07

0.00

āˆ’0.05; -0.07

āˆ’0.08

0.00; -0.18

āˆ’0.08

0.02; -0.17

H7

ā€ƒPhysical workloads (DOT) ā€”

Ļ

0.19**

0.13; 0.10

0.21**

0.16; 0.13

0.20**

0.14; 0.10

0.07

0.10; 0.07

0.03

āˆ’0.03; 0.02

Ā 

Personal factors

Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā 

H8

ā€ƒā€ƒMental healthĀ¶

r

0.06

āˆ’0.01; -0.07

0.10

0.07; -0.05

0.10

0.06; -0.03

0.00

āˆ’0.01; 0.02

āˆ’0.03

āˆ’0.04; -0.07

H9

ā€ƒā€ƒVitalityĀ¶

r

0.06

0.01; -0.08

0.10

0.09; -0.07

0.08

0.05; -0.04

āˆ’0.06

āˆ’0.06; -0.05

0.03

0.03; -0.02

H10

ā€ƒā€ƒGeneral health perceptionsĀ¶

Ļ

āˆ’0.02

0.11; -0.05

0.01

0.18**;-0.01

0.01

0.05; -0.05

0.01

0.09; -0.03

0.05

āˆ’0.12; 0.05

Ā 

Physical personal factors

Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā Ā 

H11

ā€ƒā€ƒAge (years)

r

0.05

āˆ’0.16*;-0.13

āˆ’0.01

āˆ’0.12; -0.06

āˆ’0.07

āˆ’0.23**;-0.11

āˆ’0.06

āˆ’0.13; 0.02

0.00

āˆ’0.02; -0.01

H12

ā€ƒā€ƒGender

r pbi

0.71**

Ā 

0.72**

Ā 

0.71**

Ā 

āˆ’0.06

Ā 

0.20**

Ā 

H13

ā€ƒā€ƒBody height (cm)

r

0.62**

0.24**;0.30**

0.58**

0.12; 0.20**

0.61*

0.23**;0.26**

āˆ’0.02

āˆ’0.08; -0.01

0.15**

āˆ’0.02; 0.04

H14

ā€ƒā€ƒBody weight (kg)

r

0.53**

0.27**;0.22**

0.52**

0.23**;0.19**

0.49**

0.18**;0.18

āˆ’0.16**

āˆ’0.14; -0.17

āˆ’0.01

āˆ’0.12; -0.20**

H15

ā€ƒā€ƒEducation (0ā€“6)#

Ļ

āˆ’0.07

āˆ’0.15; 0.14

āˆ’0.06

āˆ’0.13; 0.16

āˆ’0.03

āˆ’0.09; 0.22

0.10

0.00; 0.18

0.12

0.14; 0.15

  1. Abbreviations: r Pearsonā€™s correlation coefficient, Ļ Spearman rho, r pbi , Point-biserial correlation coefficient.
  2. * Correlation is significant at the Pā€‰<ā€‰.05 level (2-tailed).
  3. ** Correlation is significant at the P bonf ā€‰<ā€‰.002 level (2-tailed).
  4. ā€  Measured with Baecke Physical Activity Questionnaire [27].
  5. || Dutch questionnaire of perception of work (VBBA) [32].
  6. ā€” DOT Level of physical workloads according to the Dictionary of Occupational Titles [35].
  7. Ā¶ Rand-36 [38].
  8. # Level 1: primary school not completed; level 2: primary school completed; level 3: school for lower general secondary education finished; level 4: intermediate vocation education finished; level 5: higher vocation education finished; level 6: higher education finished.