Extended Data Table 6 Aggregated treatment effect estimates of NHS DPP implementation on HbA1c from difference-in-differences analysis

From: Quasi-experimental evaluation of a nationwide diabetes prevention programme

  1. This table reports aggregated treatment effect parameters under (a) the unconditional parallel trend assumption and the (b) conditional parallel trend assumption, adjusted for the practice-level share of patients with a recorded HbA1c test in each year. The row ‘Simple weighted average’ reports the weighted average (by group size) of all available group–time average treatment effects. The row ‘Group-specific effects’ summarizes average treatment effects by the timing of the NHS DPP implementation. The row ‘Event study’ reports average treatment effects by the length of exposure to the NHS DPP implementation. The column ‘Single parameters’ represents a further aggregation of each type of parameter as discussed in Callaway and Sant’Anna (2021).
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