Table 2. Genotype distribution in professional athletes, elite endurance athletes, professional football players and non-athletes of iron metabolism and energy efficiency polymorphisms.

Symbol	Gene	Polymorphism	dbSNP	Genotype Score	Professional athletes	Elite endurance athletes	Professional football players	Elite endurance athletes vs. Professional football players p-value	non-athletes	Professional athletes vs. non-athletes p-value	Elite endurance athletes vs. non-athletes p-value	Professional football players vs. non-athletes p-value
HFE	Homeostatic Iron Regulator	c.187C>G	rs1799945	2 = GG	16 (5.8%)	8 (5.0%)	8 (6.1%)	0.001	0 (0.0%)	0.001	<0.001	0.013
				1 = GC	115 (39.0%)	78 (48.8%)	37 (28.0%)		43 (26.8%)
				0 = CC	161 (55.2%)	74 (46.2%)	87 (65.9%)		117 (73.2%)
HFE	Homeostatic Iron Regulator	c.845G>A	rs1800562	2 = AA	1 (0.3%)	0 (0.0%)	1 (0.8%)	0.449	0 (0.0%)	0.621	0.998	0.404
				1 = GA	16 (5.5%)	10 (6.3%)	6 (4.5%)		10 (6.3%)
				0 = GG	275 (94.2%)	150 (93.7%)	125 (94.7%)		150 (93.7%)
AMPD1	Adenosine monophosphate deaminase 1	c.34C>T	rs17602729	2 = CC	233 (79.8%)	128 (80.0%)	105 (79.6%)	0.291	99 (62.1%)	0.006	0.010	0.014
				1 = CT	57 (19.5%)	32 (20.0%)	25 (18.9%)		60 (37.4%)
				0 = TT	2 (0.7%)	0 (0.0%)	2 (1.5%)		1 (0.5%)
PGC1a	Peroxisome proliferator activated receptor coactivator	c.1444 G>A	rs8192678	2 = GG	192 (65.7%)	105 (65.6%)	87 (65.9%)	0.347	88 (54.8%)	0.232	0.523	0.119
				1 = GA	91 (31.1%)	53 (33.1%)	38 (28.8%)		63 (39.7%)
				0 = AA	9 (3.2%)	2 (1.3%)	7 (5.3%)		9 (5.5%)