Table 2.

Estimates, by which we refer to multiple regression coefficients, and p-values in multi-linear regression analysis for six possible explanatory variables of chicken diversity levels in 1 Mb windows

	Red jungle fowl		Broiler		Layer		Common
	Estimate	p-value	Estimate	p-value	Estimate	p-value	Estimate	p-value
recombination rate	3.29 · 10-05	2.51 · 10-16	3.07 · 10-05	6.07 · 10-16	2.32 · 10-05	8.40 · 10-10	5.03 · 10-05	9.45 · 10-16
divergence	−7.94 · 10-06	1.68 · 10-02	−7.77 · 10-06	1.33 · 10-02	−1.82 · 10-05	1.07 · 10-08	−1.93 · 10-05	2.09 · 10-04[27]
gene density	2.30 · 10-05	4.45 · 10-08	2.11 · 10-05	1.07 · 10-07	2.19 · 10-05	3.95 · 10-08	3.81 · 10-05	6.54 · 10-09
GC content	−1.68 · 10-05	7.10 · 10-04	−1.50 · 10-05	1.37 · 10-03	−1.31 · 10-05	5.49 · 10-03	−2.60 · 10-05	7.94 · 10-04
dS	−7.23 · 10-06	8.18 · 10-02	−7.18 · 10-06	6.76 · 10-02	−1.01 · 10-05	1.03 · 10-02	−1.41 · 10-05	3.00 · 10-02
dN	−3.66 · 10-06	3.70 · 10-01	−4.64 · 10-06	2.29 · 10-01	−4.08 · 10-06	2.92 · 10-01	−7.13 · 10-06	2.63 · 10-01
	Multiple R2 = 0.1513		Multiple R2 = 0.1509		Multiple R2 = 0.1601		Multiple R2 = 0.1693
	p < 2.2 · 10-16		p < 2.2 · 10-16		p < 2.2 · 10-16		p < 2.2 · 10-16

Common variation reflects PC I of diversity level of all three populations. Estimates and p-values significant at a threshold < 0.001 are highlighted in bold.