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Table 4 Targeting, explanatory power and person separation index (PSI) for the capacity and performance metrics. SD=Standard Deviation

From: Measuring functioning and disability using household surveys: metric properties of the brief version of the WHO and World Bank model disability survey

   MDS Chile MDS Sri Lanka
Mean SD PSI Correlation a Explained varianceb Mean SD PSI Correlation a Explained varianceb
Capacity Difficulty 0,232 1,281 0,788 0,984 0,969 0,293 1,308 0,805 0,838 0,923
Ability − 1,544 1,338 − 1,189 1,477
Performance Difficulty 0,310 1,258 0,734 0,845 0,715 0,289 1,218 0,805 0,875 0,792
Ability − 1,623 0,993 − 1,394 1,208
  1. aCorrelation Full versus Brief MDS versions’ ability estimates.
  2. bExplained variance in predicting the MDS full version ability score based on the brief version’s ability estimates.