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. 2007 Jul 11;2(7):e606. doi: 10.1371/journal.pone.0000606

Table 1. Wealth class-specific estimates of opportunity for selection on total selection. (fitness, ILRS), fecundity (Ifec), and longevity (Ilong) in pre-industrial Finnish women.

Rich Middle-class Poor χ2 P
ILRS 0.287 0.357 0.660 5.99 0.003
Ifec 0.197 0.266 0.504 2.80 0.06
Ilong 0.059 0.066 0.084 2.69 0.3