Table 2: Partial correlations between independent variables and cardiorespiratory fitness according to sex, nutritional status and maturity status (n = 1,209).

	Sex		Nutritional status		Somatic maturity status
	Boys	Girls	Normal weight	Overweight/obese	Late	On time	Early
First level
Socioeconomic status	-0.017	-0.092	0.077	0.065	-0.126	-0.007	-0.072
Maternal educational status	-0.108	-0.025	-0.020	-0.090	0.006	-0.055	-0.073
Paternal educational status	-0.084	-0.052	-0.004	-0.037	0.058	-0.039	-0.068
Maternal tobacco smoking	0.074	0.041	0.039	0.019	0.090	0.017	-0.073
Paternal tobacco smoking	0.005	0.059	0.040	-0.107	-0.045	0.012	-0.068
Maternal alcohol consumption	0.031	0.007	-0.013	0.014	0.073	-0.012	-0.015
Paternal alcohol consumption	0.015	0.033	0.005	0.129	0.140	0.026	-0.006
Maternal body mass index	0.008	-0.056	0.049	-0.141	-0.050	0.007	-0.047
Paternal body mass index	-0.103	-0.074	0.004	-0.209	0.028	-0.079	-0.052
Maternal physical activity status	0.046	0.097	0.052	0.144	0.154	0.045	0.040
Paternal physical activity status	0.006	0.020	0.026	0.033	0.070	0.029	-0.082
Number of siblings	0.106	0.067	0.077	-0.062	0.164	0.051	0.151
Second level
Tobacco smoking	0.022	-0.180	-0.049	-0.153	-0.198	0.001	-0.055
Alcohol consumption	-0.044	-0.118	-0.068	-0.078	-0.098	-0.065	0.110
Early physical activity	0.123	0.080	0.174	0.158	0.221	0.144	0.102
Habitual physical activity	0.224	0.180	0.323	0.215	0.369	0.286	0.326
Screen time	-0.016	-0.158	-0.047	0.039	-0.082	-0.032	0.065
Third level
Chronological age	­-0.172	-0.533	-0.325	-0.360	-0.351	-0.287	-0.072
Age at peak height velocity	0.021	-0.237	0.281	0.034	0.419	0.349	0.309
Waist circumference	-0.403	-0.356	-0.130	-0.250	-0.246	-0.307	-0.460

The values in bold indicate P < 0.05. Adjusted according to sex.