Stable structure, hollow substance: accountability erosion after health legislation consolidation in New Zealand

Background New Zealand’s Pae Ora (Healthy Futures) Act 2022 consolidated health legislation to streamline governance. Legislative consolidation is frequently justified on the grounds that it will improve accountability by reducing fragmentation, but the assumption that structural reform translates into substantive governance improvement has rarely been tested. We examined whether consolidation achieved three concrete governance goals: structural stability, preservation of accountability language, and preservation of accountability provisions. Methods Analysis of 73 legislative versions of four core NZ health acts (version history 2007-2026). Three measures were used: structural stability (Jaccard similarity on section-number sets, Mann-Kendall trend); accountability language frequency (15-term count per 1,000 words); and accountability gaps (content analysis of 14 mapped provisions with weighted Accountability Governance Index (AGI). Results Structural stability was near-perfect throughout with no post-Pae Ora change. Accountability language density declined significantly, with a marked post-Pae Ora drop. Weighted provision-gap analysis found 36% meaningful accountability erosion, exceeding the pre-specified substantial erosion threshold. Across the 14 mapped NZPHD-to-Pae Ora provisions, 50% were Present, 29% Diluted, and 21% Absent. HDC Act triangulation provisions showed substantially higher preservation, confirming that erosion was concentrated in the Pae Ora consolidation rather than a system-wide drift. Conclusions Consolidation preserved legislative architecture while weakening substantive content, producing a “stable structure, hollow substance” pattern. Structural reorganisation can mask governance erosion. Future consolidations require concurrent accountability codification. The scheduled post-Pae Ora legislative review should incorporate an explicit accountability audit using the three-dimension framework demonstrated here.