Methods and feasibility of collecting occupational data for a large population-based cohort study in the United States: the reasons for geographic and racial differences in stroke study

Table 4 Concordance of the current job and longest held job, overall and by age

Classification	Overall (n = 4,904)^a	Age < 65 years (n = 2,777)	Age ≥ 65 years (n = 2,127)
Classification	κ (95% CI)	κ (95% CI)	κ (95% CI)
Industry
Simple (20 groups)	0.67 (0.65-0.68)	0.71 (0.70-0.73)	0.60 (0.58-0.62)
Detailed (78 groups)	0.64 (0.63-0.66)	0.69 (0.67-0.71)	0.58 (0.56-0.61)
Occupation
Broad (6 groups)	0.68 (0.67-0.70)	0.73 (0.71-0.75)	0.63 (0.60-0.65)
Simple (22 groups)	0.67 (0.66-0.68)	0.72 (0.70-0.73)	0.61 (0.58-0.63)
Detailed (93 groups)	0.64 (0.63-0.66)	0.70 (0.68-0.71)	0.58 (0.55-0.60)

Abbreviations: κ kappa coefficient, CI confidence interval.
^aLimited to participants with known industry and occupation codes for both the current and longest-held jobs, but excludes participants with jobs in the military.

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