Table 3.

The association between cardiorespiratory fitness (VO_2max) and relative aerobic load (%HRR) at work—stratified by occupation

Occupation group	Estimates [95% CI]
	Administration (n = 68)	Cleaning (n = 42)	Manufacturing (n = 293)	Transportation (n = 36)
Mean %HRRa	−0.37 [−0.56 to −0.18]	−0.18 [−0.41 to 0.05]	−0.38 [−0.47 to −0.30]	−0.35 [−0.76 to 0.06]
Max %HRRa	−0.50 [−0.84 to −0.17]	−0.30 [−0.77 to 0.18]	−0.48 [−0.60 to −0.36]	−0.09 [−0.64 to 0.47]
> 30%HRRb	−1.0% [−1.5 to −0.4%]	−1.0% [−1.8 to −0.0%]	−2.2% [−2.6 to −1.7%]	−1.4% [−3.2 to 0.4%]

Bold indicates statistically significant effects (p < 0.05)

HRR heart rate reserve, Max %HRR maximum % of HRR at which an individual has spent at least 1 min at or above during work,  > 30 %HRR percentage of time spent at work above 30 %HRR

^aEstimates are β-coefficients

^bEstimates are the absolute change in the proportion of time spent at work above 30 %HRR