International Journal of Obesity

Table a1 Correlations above the diagonal refer to women; below the diagonal refer to men

From: Childhood IQ in relation to obesity and weight gain in adult life: the National Child Development (1958) Study

	IQ	BMI 16 years	BMI 23 years	BMI 33 years	BMI 42 years	Birth weight	Mum BMI	Father BMI	Axillary hair	Age menstruation	Father's class	Qualifications	Class 33	Partner's class	Fruit	Fried food	Chips
IQ	1	−0.064	−0.125^**	−0.120^**	−0.127^**	0.111^**	−0.052^**	−0.065^**	0^**	−0.070^a	−0.312^**	0.583^**	−0.322^**	−0.244^**	0.181^**	0.129^**	0.183^**
BMI 16	0.002	1	0.639^**	0.547^**	0.498^**	0.089^**	0.241^**	0.201^**	0^**	−0.201^a	0.053	−0.050	0.036^*	0.043^*	0.054^**	0.054^**	0.046^**
BMI 23	−0.115^**	0.615^**	1	0.724^**	0.708^**	0.048^**	0.225^**	0.170^**	0^**	−0.114^a	0.109^**	−0.174^**	0.119^**	0.141^**	0.015	−0.017	−0.024
BMI 33	−0.093^**	0.509^**	0.668^**	1	0.795^**	0.049^**	0.215^**	0.143^**	0^**	−0.130^a	0.097^**	−0.153^**	0.095^**	0.109^**	0.031	−0.062	−0.051
BMI 42	−0.098^**	0.507^**	0.677^**	0.741^**	1	0.025^**	0.212^**	0.158^**	0^**	−0.133^a	0.099^**	−0.169^**	0.089^**	0.131^**	−0.005	−0.046	−0.055
Birthweight	0.081^**	0.111^**	0.078^**	0.062^**	0.078^**	1	0.142^**	0.034	0	−0.008^a	−0.054^**	0.098^**	−0.072^*	−0.024	0.094^**	0.056	0.064
Mum BMI	−0.050^**	0.224^**	0.205^**	0.179^**	0.189^**	0.135^**	1	0.084^**	0^**	−0.048^a	0.051^**	−0.072^**	0.033^**	0.041^**	0.020	0.026	0.026
Father BMI	−0.054^**	0.187^**	0.206^**	0.178^**	0.193^**	0.008	0.060^**	1	0^**	−0.042^a	0.045	−0.051^**	0.036^**	0.051	0.014	0.026	−0.001
Axillary hair	0.071^**	0.249^**	0.114^**	0.112^**	0.095^**	0.011	0.060^**	0.062^**	1	^a	^**	^**	^**	^**	^**	^**	^**
Age menstruation	^a	^a	^a	^a	^a	^a	^a	^a	^a	1^a	0.057^a	−0.091^a	0.045^a	0.041^a	−0.063^a	−0.049^a	−0.031^a
Father's class	−0.259^**	−0.006	0.090^**	0.069^**	0.061^**	−0.048^**	0.063^**	0.025	−0.045^**	^a	1	−0.328^**	0.210^**	0.205^**	−0.125^**	−0.089^**	−0.161^**
Qualifications	0.551^**	−0.025	−0.158^**	−0.087^**	−0.127^**	0.068^**	−0.089^**	−0.049^**	0.069^**	^a	−0.289^**	1	−0.456^**	−0.360^**	0.257^**	0.181^**	0.255^**
Class 33	−0.392^**	0.042^*	0.139^**	0.080^**	0.098^**	−0.033^**	0.081^**	0.043^**	−0.050^**	^a	0.244^**	−0.463^**	1	0.289^**	−0.151^**	−0.127^**	−0.192^**
Partner's class	−0.221^**	0.049^*	0.097^**	0.087^**	0.094^**	0.001	0.054^**	0.027	−0.062^**	^a	0.141^**	−0.283^**	0.281^**	1	−0.133^**	−0.109^**	−0.183^**
Fruit	0.080^**	0.067^**	0.019	0.005	0.006	0.057^**	0.010	0.003	0.056^**	^a	−0.049^**	0.132^**	−0.078^**	−0.085^**	1	0.192^**	0.253^**
Fried food	0.138^**	0.076^**	0.007	−0.022	−0.007	0.013	−0.006	0.005	0.079^**	^a	−0.094^**	0.187^**	−0.147^**	−0.141^**	0.179^**	1	0.454^**
Chips	0.162^**	0.083^**	0.025	−0.001	0.011	0.023	−0.018	0.015	0.093^**	^a	−0.131^**	0.224^**	−0.188^**	−0.165^**	0.217^**	0.417^**	1

^**Correlation is significant at the 0.01 level (two-tailed).
^*Correlation is significant at the 0.05 level (two-tailed).
^aCannot be computed because at least one of the variables is constant.

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