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Figure 1 | BMC Musculoskeletal Disorders

Figure 1

From: Factor structure and validity of the shoulder pain and disability index in a population-based study of people with shoulder symptoms

Figure 1

Principal components factor analysis of the thirteen SPADI items (N = 588). (A) Scree plot of eiganvalues: indicating two factors with eiganvalues >1. These two factors collectively explain 61.4% of the total variance. (B) Plot of varimax rotated, normalized factor loadings for each SPADI item: Factor 1, which explains 34.6% of the total variance, is interpreted as disability. Factor 2, which explains 26.8% of the total variance, is interpreted as pain.

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