Although correlations between treatment policies within domains were found, the failure to cluster hospitals indicates that a specific treatment choice within a domain is not a proxy for other treatment choices within or outside the domain.

These results imply that studying the effects of specific traumatic brain injury (TBI) interventions on outcome can be based on between-center variation without being substantially confounded by other treatments.

Provider profiles were available from 66 centers in 20 different countries in Europe and Israel.

Correlations within most of the predefined domains varied from low to high correlations.

Correlations between domains were lower, with mean correlation coefficients of 0.2.

Cluster analysis showed that policies could be grouped, but hospitals could not be grouped based on their preference.

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