Table 3.

The influence of body size (back breadth) and the control variable age on peak frequency of chest beats (Hz; N = 36).

Predictor	Estimate	SE	T value	CI lower	CI upper	P
Intercept	624.280	14.820	42.119	596.106	654.853
Body size	− 34.570	16.260	− 2.127	− 63.987	− 2.871	0.048
Age	26.730	16.260	1.644	− 5.734	59.688	0.120

Body size and age were z-transformed to a mean of 0 and standard deviation of 1. Full null model comparison: χ²₁ = 3.919; P = 0.048. CI: upper (97.5%) and lower (2.5%) confidence intervals.