Table 4.

Inter-rater reliability in occupation coding between the two coders for each classification used.

	Resolution level (number of digit)	Number of corresponding codes at the resolution level	Inter-rater reliability in job coding (95% CI) - All approaches combined
CCDO-1971	7	7907	35.7% (32.7–38.7%)
	4	500	53.5% (50.4–56.6%)
	3	81	66.5% (63.5–69.5%)
ISCO-1968	5	1504	43.2% (40.1–46.3%)
	3	282	55.9% (52.8–59.0%)
US-SOC-2010	6	840	48.1% (45.0–51.2%)
	5	461	53.9% (50.8–57.0%)
	3	97	62.9% (59.9–65.9%)
NOC-2011	4	500	53.2% (50.1–56.3%)
	3	140	58.8% (55.7–61.9%)

CI = confidence interval.