Table 1. Descriptive statistics of variables used in the study.

	children	grandchildren	genetic vectors	age	fundamental frequency (Hz)	height (cm)	weight (kg)	handgrip strength (bars)
males
mean	4.83	2.13	5.9	50.36	145.48	174.44	65.83	6.04
s.d.	3.53	3.03	4.44	18.1	21.94	7.2	9.63	1.54
N = 36
females
mean	3.43	1.75	4.33	41.57	236.59	165.61	63.8	4.5
s.d.	2.34	3.09	3.25	18.7	38.17	5.2	10.58	1.41
N = 54

Note: Genetic vectors composes of the total number of surviving children plus the number of grandchildren weighted by the presence of shared genes, or (number of children + (.5×grandchildren)).