Determine whether hub specialisation amplifies physician-productivity gains

Determine whether the difference in physician-productivity effects between single-specialty and multi-specialty surgical hubs is statistically significant and whether specialisation amplifies the productivity gains from NHS surgical hub adoption.

Background

The paper estimates larger productivity gains for single-specialty hubs than for multi-specialty hubs: 0.786 versus 0.369 in the preferred cost-weighted HVLC output per salary-weighted physician FTE measure. However, the statistical significance of this contrast varies with the estimator used. Because the evidence does not establish that the subgroup effects differ reliably, the authors refrain from interpreting the specialisation contrast as evidence that specialisation amplifies productivity gains.

References

Whether this difference is itself significant depends on the estimator used, as the Supplementary Material (Section~\ref{S-sec:S3}) reports, and we therefore treat the specialisation contrast as unresolved rather than as evidence that specialisation amplifies the gain.

— High Volume Low Complexity Surgical Hubs in England: Can They Improve Physician Productivity?  (2609.10380 - Anteneh et al., 9 Sep 2026) in Section 3.1, “Heterogeneity analyses—Hub specialisation” (Table 2)