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Depends on the mode of administration:

• Full Item Bank: Mean SEM= 2.1
• 8-Item Fixed-Length CAT: Mean SEM= 2.7
• Variable-length CAT (Min 4): Mean SEM= 3.0
• Variable-length CAT (Min 8): Mean SEM= 3.1
• 4-Item Fixed-length CAT: Mean SEM= 3.4

Calculated from SEM

• Full Item Bank: MDC= 4.9
• 8-Item Fixed-Length CAT: MDC= 6.3
• Variable-length : MDC= 7.2

Holdnack et al. (in preparation) created a "cross-walk" table to transform SCI-QOL Depression scores to scores on the PHQ-9, a gold standard measure of depression with well-established cut scores. The SCI-QOL Depression scores below are the equivalent of PHQ-9 cutoff scores.

• Mild Depression: T-score from 52-58
• Moderate Depression: T-score from 60-64
• Moderate-severe Depression: T-score from 65-67
• Severe Depression: T-score 68+

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.

(n=716, mean age = 43.0(15.3); time post injury = 7.1 years (10.0); 45% paraplegia, 54% tetraplegia).

Traumatic SCI (Tulsky et al., 2015)

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

Traumatic SCI (Tulsky et al., 2015)

• Excellent: (Cronbach's alpha= .96)

Traumatic SCI (Tulsky et al., 2015)

• Excellent concurrent validity predicating the PHQ-9 (r= .76)

Traumatic SCI (Tulsky et al., in preparation)

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

• Anxiety (GAD-7 r= .59)
• Life Satisfaction: (Satisfaction with Life Scale r= -.62)
• Resilience (SCI-QOL Resilience r = -.73)
• Positive affect (SCI-QOL Positive Affect r= -.68).

The SCI-QOL Depression item bank demonstrated good discriminant validity by weakly correlating with measures of:

• Fine motor functioning (SCI-QOL Fine Motor r= -.16)

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 (Tulsky et al., 2015)

Full Item Bank:

• Floor Effect: Excellent (0.1%)

• Ceiling Effect: Adequate to Excellent (3.1%)

8-Item Fixed-length CAT:

• Floor Effect: Adequate to Excellent (4.7%)

• Ceiling Effect: Excellent (0.1%)

Variable-length CAT (Max 12):

• Floor Effect: Adequate to Excellent (3.5%)

• Ceiling Effect: Excellent (0.1%)

Variable-length CAT (Max 8):

• Floor Effect: Adequate to Excellent (4.7%)

• Ceiling Effect: Excellent (0.1%)

4-Item Fixed-length CAT:

• Floor Effect: Adequate to Excellent (7.4%)

• Ceiling Effect: Excellent (0.1%)