Table 4.

Descriptive statistics of reproductive parameters of those F₁ offspring who survived to age 15 themselves and were successfully followed until the end of potential reproductive life (data subset 1), split by sex and social class (all mean±1 s.d.). (Lifespan here thus refers to the total number of years lived by those who survived to adulthood (age 15).)

social class	sex	total N	lifespan	age at marriage	age at first reproduction	age at last reproduction	lifetime fecundity	number of surviving offspring
rich	m	178	54.82±16.30	26.83±5.40	27.85±5.45	39.78±8.32	4.81±3.26	2.47±2.11
	f	140	61.03±16.27	24.73±5.09	25.52±4.59	38.37±5.10	5.09±3.05	2.94±2.26
middle	m	118	58.82±16.42	27.62±5.11	29.06±6.98	41.44±8.27	4.81±3.06	2.66±2.39
	f	108	63.76±16.97	27.11±6.30	27.27±5.69	38.60±6.20	4.51±2.99	2.48±1.94
poor	m	58	48.42±18.42	27.21±5.40	27.48±5.11	37.95±8.88	2.41±3.02	1.17±1.63
	f	54	52.50±19.34	28.45±6.94	28.52±5.70	35.40±6.13	2.11±2.11	0.96±1.37
all	m	354	54.41±16.89	27.15±5.29	28.25±6.03	40.19±8.40	4.42±3.27	2.32±2.19
	f	302	60.50±17.49	26.17±5.98	26.63±5.30	38.01±5.77	4.35±3.07	2.42±2.13