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Reliability of the Barthel Index
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Appendices
Inter-rater and intra-rater Spearman rank-order correlation coefficients of 0.91 to
1.00 with a median of 0.96 were found with percentages of agreement ranging
from 69% to 100%; and Kappa coefficient values ranging from 0.47 to 1.00 for
the initial evaluation were also found. Intra-rater reliabilities were reported as:
excellent agreement range for 83% of Kappa values; and Spearman rank-order
correlation coefficients of 0.95 to 1.00 with a median of 0.99.
(Mahoney, Barthel and Surya, 1965).