Table 2.

Standardized lifespan and LRS are the means of the standardized values ((log-transformed value – mean of decade)/standard deviation of decade). Average reproduction and average lifespan are derived by multiplying the standardized means by the standard deviations for each sibling category and adding them to the mean for all sibling categories across all decades. Analyses were conducted on all individuals born between 1700 and 1919.

sibling number	standardized reproduction	average reproduction	standardized lifespan	average lifespan	n
0	0.129 (0.01)	2.71 (0.02)	0.086 (0.00)	52.4 (0.24)	14 736
1	0.079 (0.01)	2.55 (0.02)	0.082 (0.00)	52.2 (0.24)	14 049
2	0.066 (0.01)	2.51 (0.02)	0.079 (0.00)	52.1 (0.22)	16 448
3	0.064 (0.00)	2.50 (0.02)	0.074 (0.00)	52.0 (0.21)	18 560
4	0.052 (0.00)	2.46 (0.02)	0.024 (0.01)	50.5 (0.22)	18 535
5	0.026 (0.01)	2.38 (0.02)	0.007 (0.01)	49.9 (0.23)	17 004
6	0.022 (0.01)	2.37 (0.02)	−0.016 (0.01)	49.2 (0.25)	15 305
7	0.011 (0.01)	2.33 (0.02)	−0.045 (0.01)	48.2 (0.27)	13 317
8	−0.021 (0.01)	2.23 (0.03)	−0.075 (0.01)	47.2 (0.30)	10 472
9	−0.058 (0.01)	2.11 (0.03)	−0.122 (0.01)	45.6 (0.34)	8341
10	−0.036 (0.01)	2.18 (0.03)	−0.140 (0.01)	45.0 (0.38)	6844
>10	−0.077 (0.01)	2.04 (0.02)	−0.173 (0.01)	43.7 (0.26)	14 209