. Author manuscript; available in PMC: 2016 Apr 5.

Published in final edited form as: Psychoneuroendocrinology. 2012 Jul 17;38(3):331–340. doi: 10.1016/j.psyneuen.2012.06.009

Table 2.

Correlations of the log-transformed, winsorized cortisol variable with predictor variables and covariates.

	n	Correlation coefficients (p-values)
Maternal education^b	333	−0.18 (0.001)
Paternal education^b	332	−0.18 (0.001)
Hair zinc^a	339	−0.15 (0.006)
Age^a	339	−0.09 (0.098)
Gender^c	339	−0.01 (0.790)
Parenthood status^c	339	0.01 (0.920)
Annual family income^b	275	−0.07 (0.235)

Legend: n: number of children in the respective subgroups; p-values: values for statistical probability. The categories for the variables are shown in Table 1 (e.g., maternal education: Less than high school = 1; high school = 2; some college or university = 3; University or college degree = 4).

Bold font indicates significant p-values.

Pearson correlations were calculated for the continuous variables.

Polyserial correlations were calculated for the ordinal variables.

Biserial correlations were calculated for the dichotomous variables.