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Depends on the mode of administration:

• Full Item Bank: Mean SEM= 0.22
• 9-Item Fixed-length CAT: Mean SEM= 0.29
• Variable-length CAT (Min 4): Mean SEM= 0.32
• Variable-length CAT (Min 8): Mean SEM= 0.29
• 9-Item Short Form: Mean SEM= 0.33

Calculated from SEM:

• Full Item Bank: MDC= 0.51
• 9-Item Fixed-length CAT: MDC= 0.63
• Variable-length CAT: MDC= 0.67

Kisala et al. (2015) created a "cross-walk" table to transform SCI-QOL Anxiety scores to scores on the GAD-7, a gold standard measure of anxiety with well-established cut scores.

The SCI-QOL Anxiety scores below are the equivalent of GAD-7 cutoff scores:

• Mild Anxiety: T-score of 49-55
• Moderate Anxiety: T-score of 56-61
• Severe Anxiety: T-Score of 62+

General population (2000 U.S. Census). The normative data reference the calibration sample from PROMIS, which matches the demographics of the 2000 U.S. Census.

Traumatic SCI (Kisala et al., 2015)

Full Item Bank:

• Excellent: (Pearson's r= 0.80)
• Excellent: (ICC = .80)

Traumatic SCI (Kisala et al., 2015)

• Full Item Bank - Excellent: (Cronbach¡¯s alpha= .95)
• 9-Item Fixed CAT - Excellent: (Cronbach's alpha= .92)
• Variable-length CAT (Min 4) - Excellent: (Cronbach's alpha= .91)
• Variable-length CAT (Min 8) - Excellent: (Cronbach's alpha= .92)
• 9-Item Short Form - Excellent: (Cronbach's alpha= .90)

 Traumatic SCI (Kisala et al., 2015)

• Excellent: Predicting GAD-7 scores (r= .67)

Traumatic SCI (Tulsky et al., in preparation)

The SCI-QOL Anxiety item bank demonstrated good convergent validity by correlating strongly with measures of:

• Depression (PHQ-9 r= .61)
• Life Satisfaction (Satisfaction with Life Scale r= -.53),
• Resilience (SCI-QOL Resilience r= -.68),
• Positive affect (SCI-QOL Positive Affect r= -.59).

The SCI-QOL Anxiety item bank demonstrated good discriminant validity by not correlating with measures of:

• Fine motor functioning (SCI-QOL Fine Motor r= -.046)

Some SCI-QOL items were derived from the focus groups and cognitive interviews that founded the PROMIS and/or Neuro-QOL measurement systems. The Neuro-QOL focus groups comprised patients with neurological illness (n= 64) and caregivers (n= 19).

Other SCI-QOL items were derived from focus groups and interviews with individuals with traumatic SCI (n=65) and clinicians who specialize in SCI (n=42).

Not statistically assessed, but content was generated from individuals with SCI and expert clinicians, so face validity is  believed to be strong.

Traumatic SCI (Kisala et al., 2015)

Full Item Bank:

• Floor Effects: Adequate to Excellent (2.8%)
• Ceiling Effects: Excellent (0.1%)

9-Item Fixed-length CAT:

• Floor Effects: Adequate to Excellent (7.5%)
• Ceiling Effects: Excellent (0.1%)

Variable-length CAT (Min 4):

• Floor Effects: Adequate to Excellent (6.8%)
• Ceiling Effects: Excellent (0.1%)

Variable Length CAT (Min 8):

• Floor Effects: Adequate to Excellent (6.8%)
• Ceiling Effects: Excellent (0.1%)

9-Item Short Form:

• Floor Effects: Adequate to Excellent (6.4%)
• Ceiling Effects: Excellent (0.1%)