| | |
Construct validity
|
Construct responsiveness
|
|---|
| |
Correlations#
| |
Correlations
|
|---|
|
Hypothesis*
|
Expected
|
Observed
|
Hypothesis
|
Expected
|
Observed
|
|---|
|
ODIsum. score
|
PEI-BPsum. score
|
a
|
< − 0.5
|
− 0.5407
|
a
|
< − 0.5
|
− 0.5552
|
|
BIPQsum. score
|
PEI-BPsum. score
|
a
|
< − 0.5
|
− 0.5808
|
a
|
< − 0.5
|
− 0.5375
|
|
BIPQq.3
|
PEI-BPsum. score
|
b
|
> 0.5
|
0.4341
|
b
|
> 0.5
|
0.5484
|
|
BIPQq.7
|
PEI-BPq. 2
|
b
|
> 0.5
|
0.5962
|
b
|
> 0.5
|
0.4635
|
|
FABQphys. activity
|
PEI-BPsum. score
|
c
|
− 0.3 to − 0.5
|
− 0.3043
|
c
|
− 0.3 to − 0.5
|
− 0.4301
|
|
SF-36 Mental health
|
PEI-BPsum. score
|
d
|
0.3 to 0.5
|
0.4986
|
d
|
0.3 to 0.5
|
0.4069
|
|
Educational level
|
PEI-BPsum. score
|
e
|
≤ 0.3
|
0.1259
| | | |
|
Number of previous episodes of LBP
|
PEI-BPsum. score
|
f
|
≥ − 0.3
|
− 0.0365
| | | |
- ODI = Oswestry Disability Index; sum. score = summary score; PEI-BP = Patient Enablement Instrument for Back Pain; BIPQ = Brief Illness Perception Questionnaire; q = question; FABQphys.activity = Fear Avoidance Belief Questionnaire, the physical activity sub scale; SF-36 = Short Form 36
- *Hypothesis: (a) Scales are expected to measure the same construct. The correlation is expected to be negative and high (< -0.5). (b) Scales are expected to measure the same construct. The correlation is expected to be positive and high (> 0.5). (c) Scales are related but do not measure the same construct. The correlation is expected to be negative and moderate (-0.3 to -0.5). (d) Scales are related but do not measure the same construct. The correlation is expected to be positive and moderate (0.3 to 0.5). (e) Scales are expected not to measure the same construct. The correlation is expected to be positive and low (≤ 0.3). (f) Scales are expected not to measure the same construct. The correlation is expected to be negative and low (≥ -0.3)
- Bold numbers are positive hypotheses and plain numbers are negative hypotheses
- #Spearman’s rank correlation coefficient
