Table 5.

Parameter estimates of fixed effects for the primary outcome variable ‘perceived exertion’ (Borg rating)

Parameter	Estimate	95% Confidence interval		P value
		Lower	Upper
Intercept	1.65	−2.63	5.93	0.444
Gender
Female	1.83	−0.23	3.89	0.080
Male	0a
Duration (min)	0.08	−0.17	0.33	0.538
Age (years)
<30	2.16	0.08	4.25	0.042
30–45	0.77	−1.18	2.73	0.432
>45	0a
Inclinationb > 20°	0.12	0.08	0.16	<0.001

^aReference category (parameter set to zero).

^bInclination = proportion of time in a forward bending trunk posture.