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Table 5 Hypothesis testing in construct validity and construct responsiveness of the Patient Enablement Instrument of Back Pain

From: The patient enablement instrument for back pain: reliability, content validity, construct validity and responsiveness

   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    
  1. 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
  2. *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)
  3. Bold numbers are positive hypotheses and plain numbers are negative hypotheses
  4. #Spearman’s rank correlation coefficient