Mediation analysis (Hayes PROCESS, version 4.1.51,52) of the relation between postterm birth with vigorous-intensity physical activity (VPA) and heart rate variables among 46-year-old adults from Northern Finland Birth Cohort 1966. The values are the unstandardized regression coefficients (β) of effects of postterm birth on VPA (min day−1) (A), HRpeak (B), HRR30 (C), and HRRslope (D). The mediating variables were VPA and BMI, and the control variables were age and sex at assessment. Estimates are based on a bootstrapping procedure with 10 000 bootstrap samples. * P < 0.05, and ‡ P < 0.001 compared with adults born at term. BMI, body mass index; HRpeak, peak heart rate during a submaximal step test; HRR30, heart rate recovery 30 sec after the step test; HRRslope, the steepest 30-s slope after the step test; VPA, vigorous-intensity physical activity (device-measured).
