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. 2015 Jan 21;25(3):527–536. doi: 10.1007/s10926-014-9559-9

Text Box A.

Eight hypotheses for examining construct validity of the Spinal Function Sort

Reference test The validity is not rejected if the strength of the relationship of SFS with r cut-off values
1

Lifting tests:

 Lifting floor to waist

 Lifting waist to overhead

 Short carry two-handed

 One-handed carrying right

Functional lifting tests is moderate to high 0.50 ≤ r ≤ 0.89
2 Self-reported disability (NDI) Self-reported disability is moderate 0.50 ≤ r ≤ 0.70
3 Pain now (NRS) Pain is low or weak 0.25 < r < 0.50
4 Anxiety (HADS A) Anxiety is low or weak 0.25 < r < 0.50
5 Depression (HADS D) Depression is low or weak 0.25 < r < 0.50

Lifting tests include lifting floor to waist (kg), lifting waist to overhead (kg),) short carry two-handed (kg), one-handed carrying right (kg). r = correlation coefficient, absolute value. The direction of the association depends on the scoring of the reference measure

NRS Numeric rating scale, NDI Neck Disability Questionnaire, HADS Hospital Anxiety Depression Scale