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      "years": 5,
      "residual_df": 3,
      "hac_lag": 1,
      "trend": false,
      "causal_pool_weight": 0
    },
    {
      "series": "old_region",
      "test": "pre2014_linear_slope",
      "log_coefficient": 0.06840840263633119,
      "se": 0.020036578333800938,
      "ratio": 1.0708025377693149,
      "low": 1.0046538636893574,
      "high": 1.141306589597453,
      "p": 0.04202183273366756,
      "years": 5,
      "residual_df": 3,
      "hac_lag": 2,
      "trend": false,
      "causal_pool_weight": 0
    },
    {
      "series": "young_old_triple",
      "test": "pre2014_linear_slope",
      "log_coefficient": 0.004343577205873134,
      "se": 0.058337628275769195,
      "ratio": 1.0043530242103236,
      "low": 0.8341743945071101,
      "high": 1.2092495332902775,
      "p": 0.9453344391556124,
      "years": 5,
      "residual_df": 3,
      "hac_lag": 0,
      "trend": false,
      "causal_pool_weight": 0
    },
    {
      "series": "young_old_triple",
      "test": "pre2014_linear_slope",
      "log_coefficient": 0.004343577205873134,
      "se": 0.05365264163442314,
      "ratio": 1.0043530242103236,
      "low": 0.846704880732875,
      "high": 1.1913537056350842,
      "p": 0.9405743181313204,
      "years": 5,
      "residual_df": 3,
      "hac_lag": 1,
      "trend": false,
      "causal_pool_weight": 0
    },
    {
      "series": "young_old_triple",
      "test": "pre2014_linear_slope",
      "log_coefficient": 0.004343577205873134,
      "se": 0.05196889152152352,
      "ratio": 1.0043530242103236,
      "low": 0.8512540791247756,
      "high": 1.1849869762475056,
      "p": 0.9386548426425025,
      "years": 5,
      "residual_df": 3,
      "hac_lag": 2,
      "trend": false,
      "causal_pool_weight": 0
    }
  ],
  "covariance": "Bartlett HAC with finite-sample correction and t residual df; very short series",
  "selection": "Exploratory grid declared after reviewing published summary results; all fits retained",
  "limitations": [
    "Middle-age denominators excluded due to source inconsistency",
    "Three rollout groups are not individual regions; no region-clustered inference",
    "Only five pre2014 years; non-rejection has low diagnostic power",
    "2014 transition omitted; 2019 comparator adoption addressed only by end-year sensitivity",
    "Ramp is a stylized cohort replacement proxy, not observed uptake",
    "Full-window linear trend may absorb effects or impose incorrect counterfactuals",
    "HAC bandwidth sensitivity does not guarantee valid inference with 9-10 annual observations",
    "Ratios are changes in aggregate rate contrasts, not individual vaccination RRs",
    "No power, equivalence, or causal-synthesis claim"
  ]
}