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Change in variation (Δv) in a major complications, b medical complications, and c surgical-site complications between the early 2008–2010 period and the late 2011–2013 period. The connected dots represent individual hospitals over time. The variation in major complications across all the hospitals decreased by 44 %. The variation in medical complications decreased by 33 %, and the variation in surgical-site complications decreased by 6 %
