. 2018 Oct 4;74(4):544–549. doi: 10.1093/gerona/gly102

Table 3.

Additional Variance in SPPB Performance Explained by Neuromuscular Impairments

Domains	Independent Variables	Percent Variance Explained (R²)	AIC
SPPB total score	Covariates^a	22.7	607.3
SPPB total score	Covariates + neuromuscular impairments^b	40.4	507.6
SPPB balance score	Covariates	20.1	3.5
SPPB balance score	Covariates + neuromuscular impairments	26.8	−22.2
Gait speed	Covariates	31.9	−1,471.6
Gait speed	Covariates + neuromuscular impairments	44.7	−1,549.5
SPPB chair stand score	Covariates	8.3	135.6
SPPB chair stand score	Covariates + neuromuscular impairments	23.9	67.0

Note: AIC = Akaike information criterion; SPPB = Short Physical Performance Battery.

^aCovariates included age, race, gender, Katz comorbidity score, body mass index, Patient Health Questionnaire-9 score (depression), and Digit Symbol Substitution Test score. ^bLeg strength, leg velocity, trunk extensor endurance, knee flexion range of motion, presence/absence of ankle range of motion limitation, and sensory loss.