Table 5.

Mean values of iron metabolism between both chicken and Pyrenees’ beef diet’s groups by gender, in the overall sample, and in the first period of the study.

Blood Samples Iron Metabolism		Chicken-Based Diet Group				Pyrenees Beef-Based Diet Group				Mean Differences between Beginning and End between Both Groups
		Before	After	F	p 1	Before	After	F	p 1	Mean Diff	95% IC	F	p 2
Overall sample (n = 47)
Iron (μg/dL) (n = 46)	Male	98.8 ± 35.30	102.5 ± 37.41	0.279	0.602	116.91 ± 43.55	104.96 ± 30.97	1.065	0.313	12.21	−18.78; 43.20	0.671	0.422
	Female	103.50 ± 44.37	91.78 ± 29.92	1.175	0.290	108.96 ± 30.97	94.13 ± 36.50	2.741	0.112	0.000	−24; 44; 24.44	0.000	1.000
Transferrin Saturation Index (%)	Male	30.53 ± 10.63	30.91 ± 10.25	0.035	0.852	39.47 ± 15.10	32.50 ± 10.63	3.239	0.085	7.86	1.99; 17.72	2.734	0.112
	Female	30.76 ± 12.25	26.73 ± 9.32	1.799	0.194	31.36 ± 12.62	26.50 ± 11.15	4.211	0.052	1.06	−5.79; 7.91	0.104	0.750
1st period of the study (Control: n = 23. Intervention. n = 24)
Ferritin (ng/mL)	Male	65.13 ± 28.34	76.00 ± 72.69	0.125	0.736	111.42 ± 51.75	86.00 ± 41.86	20.218	<0.001	36.29	−7.44; 80.02	2.962	0.099
	Female	51.65 ± 31.41	30.16 ± 16.35	13.828	0.002	33.05 ± 26.31	20.57 ± 16.11	6.921	0.039	−9.00	−28.46; 10.46	0.925	0.347
Transferrin (mg/dL)	Male	257.14 ± 31.27	279.55 ± 34.72	8.216	0.029	236.12 ± 23.22	252.32 ± 25.26	21.192	<0.001	1.05	−12.22; 14.32	0.027	0.871
	Female	263.31 ± 35.52	274.91 ± 28.84	5.746	0.030	257.57 ± 25.51	300.66 ± 24.63	24.308	<0.001	6.74	−5.16; 18.63	1.387	0.252

Abbreviations: Mean dif, mean difference; μg, micrograms; dL, deciliter; %, percentage; ng, nanograms; mL, milliliter; F, F statistic; IC, confidence interval. ¹ Multivariate contrast between the beginning and the end of each corresponding food product (chicken or beef). ² Multivariate contrast between the mean differences (final—beginning) of both food products (chicken or beef) periods.