For bladder education, center effects added about 30% to the explained variation. The majority of the variance in interdisciplinary conferencing (66% added) may be due to substantial differences in how conferencing is conducted at various centers. These increases suggest that focusing on patient and injury characteristics may be supplemented with center effects to help explain variation in time spent in specific areas of teaching and care management work done with patients at the bedside. The significant variation in time spent should prove useful in the eventual effort to correlate interventions with key patient outcomes.