The non-linear risk of mortality by income level in a healthy population: US National Health and Nutrition Examination Survey mortality follow-up cohort, 1988–2001

Table 4 Proportional Hazard model fit statistics with alternative income terms, healthy restricted population, age 18–64, NHANES mortality follow-up cohort, 1988–2001

All models adjust for age (continuous), marital status (2 category), race/ethnicity (4 category), occupation (5 category) and education (as smoothed continuous term).
Note: Degrees of freedom between models for men and women may differ because when no events occurred within a particular strata, the covariate was omitted from all models within that gender and cause of death (this occurred for cancer mortality among women of the "other" race/ethnicity category, injury mortality for women of occupational category 3, heart disease mortality for men of the "other" race/ethnicity category, and cancer mortality for men of occupational category 5).

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