Table 1.

Total net energy production by age and reproductive class, Ache population.

	agea
	<30	30–54	≥55
Ache population census (individuals aged more than 15 years)
monogamous	51	40	8
polygynous	14	6	0
single males	38	17	3
single females	5	5	13
total	108	68	24
	<30	30–55	>55
sum net daily caloric production (all nuclear families or individuals)
monogamous	7872	−22 261	5907
polygynous	−6629	−15 109
single males	19 389	54 613	2427
single females	−7505	−8659	−9756
maternal orphans	−17 448

^aRefers to wife's age for married couples.