Table 2.

Univariate results. Differences between groups with age, ethnicity, and relationship status as covariates. Negative estimates (b with standard error) indicate lower scores in the non-circumcised group. As measures of effect size and model fitness, partial eta squared (η²_p, with 95% CI) and R squared (R²) are reported. df: degrees of freedom.

Psychological construct	scale	Range	b	St. Err	F value	df	p	η2p	η2p 95% CI	R2
Attachment	Anxiety	1–7	-.299	0.118	6.44	603	.011	.011	[0.001, 0.032]	.109
	Avoidance	1–7	-.306	0.107	8.22	603	.004	.013	[0.001, 0.037]	.092
Personality	Openness	1–5	.030	0.067	0.19	603	.660	.000	[0.000, 0.009]	.019
	Conscientiousness	1–5	.160	0.071	5.06	603	.025	.008	[0.000, 0.028]	.046
	Extraversion	1–5	.088	0.089	0.99	604	.321	.002	[0.000, 0.014]	.070
	Agreeableness	1–5	.180	0.069	6.72	603	.010	.011	[0.001, 0.033]	.065
	Neuroticism	1–5	-.143	0.087	2.72	603	.100	.004	[0.000, 0.021]	.051
	Stability	0–5	.161	0.063	6.49	603	.011	.011	[0.001, 0.033]	.065
	Plasticity	0–5	.054	0.064	0.70	604	.402	.001	[0.000, 0.013]	.045
Empathy	Perspective taking	1–5	.112	0.080	1.97	600	.161	.003	[0.000, 0.018]	.018
	Empathic concern	1–5	.093	0.085	1.19	600	.275	.002	[0.000, 0.015]	.057
Trust	Towards institutions	1–5	.081	0.067	1.50	520	.222	.003	[0.000, 0.019]	.017
	Towards known people	1–5	.092	0.081	1.29	520	.256	.002	[0.000, 0.018]	.022
	Towards strangers	1–5	.051	0.082	0.38	520	.536	.001	[0.000, 0.012]	.022
Sociosexuality	Behavior	1–9	-.377	0.168	5.00	520	.026	.010	[0.000, 0.033]	.074
	Attitude	1–9	-.465	0.235	3.91	520	.049	.007	[0.000, 0.029]	.028
	Desire	0–9	-.894	0.208	18.44	520	.000	.034	[0.010, 0.070]	.073
Sexual libido	Solitary	0–8	-.354	0.170	4.33	520	.038	.008	[0.000, 0.030]	.039
	Dyadic	0–8	-.430	0.133	10.39	520	.001	.020	[0.003, 0.049]	.069
Stress	Stress	0–5	-.286	0.087	10.76	521	.001	.020	[0.003, 0.050]	.055
Sensation seeking	Sensation seeking	1–5	-.171	0.085	4.08	550	.044	.007	[0.000, 0.028]	.037