Sex-specific relationships among iron status biomarkers, athletic performance, maturity, and dietary intakes in pre-adolescent and adolescent athletes

Shoemaker, Marni E.; Gillen, Zachary M.; Mckay, Brianna D.; Bohannon, Nicholas A.; Gibson, Sydney M.; Koehler, Karsten; Cramer, Joel T.

doi:10.1186/s12970-019-0306-7

Journal of the International Society of Sports Nutrition

Table 2 Pearson product moment correlation coefficient matrix among all variables for composite sample of young athletes

From: Sex-specific relationships among iron status biomarkers, athletic performance, maturity, and dietary intakes in pre-adolescent and adolescent athletes

	Age		Maturity Offset		Height		Weight		BF%		Arm eCSA		Thigh eCSA		VJ		BJ		PA		LC		20YD		PPU		Hb		Ferritin		sTfR		Energy Intake		Protein	Fat		Carbohydrate
N pairs	249		249		249		249		244		246		245		246		247		247		245		248		246		128		118		105		97		97	97		97
	M	F	M	F	M	F	M	F	M	F	M	F	M	F	M	F	M	F	M	F	M	F	M	F	M	F	M	F	M	F	M	F	M	F	M	F	M	F	M	F
N pairs	179	70	179	70	179	70	179	70	175	69	176	70	175	70	177	69	178	69	177	70	176	69	178	70	177	69	100	28	94	24	76	29	66	31	66	31	66	31	66	31
Maturity Offset	.875^a
Maturity Offset	.946^a	.972^a
Height	.837^a		.802^a
Height	.839^a	.859^a	.927^a	.945^a
Weight	.690^a		.714^a		.800^a
Weight	.669^•	.682^a	.841^a	.779^a	.812^a	.748^a
BF%	−.103		−.034		−.056		.352^a
BF%	−.260^a	.333^a	−.173^ac	.425^a	−.166^a	.378^a	.250^a	.775^a
Arm eCSA	.459^a		.347^a		.506^a		.463^a		−.388^a
Arm eCSA	.507^a	.386^a	.550^a	.430^a	.519^a	.398^a	.416^a	.639^a	−.508^a	.251^ac
Thigh eCSA	.666^a		.632^a		.704^a		.716^a		−.073		.591^a
Thigh eCSA	.667^a	.696^a	.754^a	.747^a	.692^a	.726^a	.721^a	.681^a	−.140^a	.245^ac	.573^a	.638^a
VJ	.636^a		.447^a		.586^a		.321^a		−.496^a		.566^a		.537^a
VJ	.674^a	.616^a	.627^a	.613^a	.575^a	^.593^a	.303^a	.321^a	−.585^a	−.097	.569^a	.336^a	.509^a	.593^a
BJ	.639^a		.452^a		.571^a		.290^a		−.453^a		.530^a		.526^a		.844^a
BJ	.656^a	.664^a	.589^a	.669^a	.527^a	.683^a	.261^a	.323^a	−.544^a	.083	.558^a	.225	.499^a	.564^a	.878^a	.663^a
PA	−.635^a		−.434^a		−.512^a		−.184^a		.496^a		−.401^a		−.382^a		−.820^a		−.803^a
PA	−.621^a	−.716^a	−.523^a	−.673^a	−.465^a	−.619^a	−.144^b	−.249^a	.608^a	.069	−.423^a	−.127	−.323^a	−.509^a	−.840^a	−.713^a	−.834^a	−.662^a
LC	−.606^a		−.410^a		− 493^a		−.201^a		.473^a		−.433^a		−.369^a		−.762^a		−.748^a		.920^a
LC	−.600^a	−.654^a	−.505^a	−.610^a	−.462^a	−.545^a	−.165^a	−.251^a	.581^a	.055	−.462^a	−.134	−.314^a	.479^a	−.761^a	−.726^a	−.773^a	−.612^a	.926^a	.885^a
20YD	−.593^a		−.428^a		−.485^a		−.151^a		.470^a		−.349^a		−.345^a		−.754^a		−.734^a		.874^a		.811^a
20YD	−.569^a	−.661^a	−.476^a	−.619^a	−.399^a	−.595^a	−.100^b	−.255^ac	.600^a	.066	−.386^a	−.129	−.289^a	−.471^a	−.767^a	−.721^a	.777^a	−.600^a	.885^a	.847^a	.843^a	.709^a
PPU	.585^a		.478^a		.598^a		.660^a		−.041		.508^a		.664^a		.485^a		.520^a		−.399^a		−.396^a		−.346^a
PPU	.680^a	.381^a	.754^a	.390^a	.650^a	.343^a	.731^•	.350^a	−.039	.158	.497^a	.239^a	.719^a	.343^a	.491^a	.190	.482^a	.423^a	−.397^a	−.232	−.393^a	−.216	−.373^a	−.157
Hb	.184^a		.139		.194^a		.159		−.037		.075		.086		.247^a		.214^a		−.230^a		−.228^a		−.204^a		.221^a
Hb	.202^a	.145	.188	.157	.219^a	.101	.112	.283	−.147	.288	.031	.205	.102	.026	.331^a	−.002	.277^a	.037	−.317^a	.064	−.284^a	−.034	−.375^a	.177	.237^a	.146
Ferritin	−.016		−.027		.099		.252^a		.278^a		−.049		−.052		−.137		−.166		.181		.141		.181^a		.070		.065
Ferritin	.019	−.011	.045	.081	.063	.195	.246^a	.345	.323^a	.257	−.137	.386	−.087	.130	−.201	−.184	−.272^a	.150	.222^a	.360	.188	.313	.223^a	.200	.033	−.034	.000	.606^a
sTfR	.009^b		.099		.050		.061		.005		.048		.046		−.093^b		−.047		.073^b		.088^b		.070^b		−.011		.033		−.223^ac
sTfR	.126	−.295	.196	−.240	.132	−.182	.093	−.001	−.067^b	.200	.125	−.183	.132	−.215	.084	−.562^a	.068	−.308	−.079	.522^a	−.092	.649^a	−.132	.521^a	−.001	.126	.023	.086	−.262^ac	.228
Energy Intake	.047		−.054		.088		−.052		−.298^a		.182		.112		.276^a		.253^a		−.266^a		−.252^a		−.205^a		.088		−.080		−.053		−.272^a
Energy Intake	.051	.015	.067	−.045	.084	−.041	−.068	−.250	−.281^a	−.344	.162	−.076	.139	−.084	.263^a	.188	.187	.240	−.265^a	−.102	−.186	−.233	−.197	−.146	−.101	−.326	−.133	.040	−.101	.236	−.297	−.278
Protein	.153		.041		.247^a		.195		−.162		.325^a		.288^a		.312^a		.260^a		−.237		−.217^a		−.193^b		.208^ac		.017		.131		−.222		.763^a
Protein	.251^a	−.132	.285^a	−.141	.280^b	−.46	.202	−.169	−.138	−.232	.295^ac	.020	.352^a	−.096	.290^a	.213	.201	.139	−.213	−.054	−.144	−.142	−.162	−.151	.215	−.326	−.030	.143	.093	.244	−.234	−.198	.789^a	.577^a
Fat	.045		.003		.076		−.039		−.210^a		.071		.122		.174		.154		−.179		−.140		−.133		.096		−.194		−.117		−.218		.895^a		.700^a
Fat	.035	.056	.061	.002	.080	.002	−.038	−.162	−.198	−.231	.055	−.033	.179	−.103	.164	.148	.112	.174	−.173	−.121	−.093	−.150	−.105	−.143	.130	−.186	−.185	−.238	−.093	−.151	−.195	−.312	.916^a	.847^a	.731^a	.623^a
Carbo-hydrate	−.029		−.132		−.011		−.170		−.340^a		.144		.024		.245^a		.243^a		−.253^a		−.271^a		−.199^b		−.018		.010		−.052		−.248^b		.839^a		.425^a		.551^a
Carbo-hydrate	−.066	.019	−.071	−.031	.043	−.051	−.222	−.229	−.342^a	−.324	.139	−.129	−.056	−.024	.249^a	.120	.180	.222	−.277^a	−.054	−.219	−.231	−.229	−.080	−.032	−.288	−.094	.237	−.162	.454	−.341^a	−.125	.852^a	.781^a	.469^a	.114	.614^a	.357^a
Iron	.138		.032		.153		−.029		−.274^a		.091^b		.162		.312^a		.215^ac		−.220^ac		−.224^ac		−.242^ac		.001		.074		.112		−.240		.414^a		.348^a		.271^a		.440^a
Iron	.061	.436^a	.069	.387^a	.086	.323	−.109	.162	−.264^ac	−.314	−.011	.363^a	.072	.535^a	.225	.565^a	.078	.568^a	−.130	−.397^a	−.177	−.465^a	−.155	−.466^a	−.056	−.130	.030	.223	.055	.365	−.217	−.341	.392^a	.377^a	.329^a	.155	.288^a	.126	.414^a	.476^a

The top row indicates the correlation with all athletes and the bottom row indicates the correlation separated by male (M) on the left side and female (F) on the right side
^aCorrelation is significant at the 0.05 level with outliers included; ^bCorrelation became significant with removal of outliers; ^cCorrelation became non-significant with removal of outliers

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