{
  "industry": "Heavy & Civil Engineering Construction",
  "naics": "237",
  "metro": "Columbus, OH",
  "grain_of_margin": "national",
  "national_net_margin_pct": 11.2,
  "metro_establishments": 170.0,
  "metro_employment": 6428.0,
  "metro_avg_weekly_wage": null,
  "note": "Margin is national. Counts + wage are metro (CBSA) grain. No local margin exists."
}