FIGURE 2.

Restricted cubic splines of the hazard ratios of incident heart failure with socioeconomic status and cardiorespiratory fitness in subgroups of each exposure. (A) SES and HF risk in low CRF group (p‐value for nonlinearity =.43); (B) SES and HF risk in high CRF group (p‐value for nonlinearity =.48); (C) CRF and HF risk in high SES group (p‐value for nonlinearity =.86); (D) CRF and HF risk in low SES group (p‐value for nonlinearity =.43). CRF, cardiorespiratory fitness; HF, heart failure; SES, socioeconomic status. Models were adjusted for age, systolic blood pressure, body mass index, heart rate, smoking status, history of type 2 diabetes, history of coronary heart disease, total cholesterol, high‐density lipoprotein cholesterol and physical activity