Accuracy of fatal occupational injury registration in a high-income country: A comparison of two-source capture-recapture estimates with the number of cases identified in four register systems in Norway, 2000–2003

•Statistics from the Norwegian Labour Inspection Authority under-reported fatal occupational injuries.•The Labour Inspection Authority had the most complete register of the four registration systems.•The actual work injury mortality rate was 27.6 per 1 million employed, which is 44% higher than the official rate of 19.2.•Capture-recapture models gave estimates close to the total number of cases identified in the four registration systems.