Table 3.

Incidence Rate Ratios by Quartile of Income and by Tertile of Self-Reported Financial Strain

Quartile	Income $	IRR (95% CI)
1 (Reference)	62,170–192,500	1
2	50,194–61,897	1.16 (1.13–1.19)
3	41,541–49,239	1.46 (1.43–1.50)
4	14,999–40,039	1.89 (1.85–1.93)
Tertile	Financial strain %	IRR (95% CI)
1 (Reference)	0–32	1
2	34–52	1.17 (1.15–1.19)
3	53–100	1.51 (1.49–1.54)