Table 8.

Coefficients of the multiple linear regression analysis model for dependent variable Semen volume.

Model predictor*	Unstandardized coefficients		Standardized coefficient	P	95% confidence interval for beta
	B	Stand error	Beta		Lower bound	Upper bound
Semen volume	3.74	0.59	-	0.00	2.58	4.90
Age	−0.03	0.01	−0.19	0.02	−0.06	−0.00
Obesity	−0.47	0.29	−0.14	0.10	−1.04	0.09
Sedentary lifestyle	−0.20	0.23	−0.07	0.39	−0.65	0.26
Tobacco smoking	−0.56	0.47	−0.10	0.23	−1.49	0.36
Alcohol consumption	0.25	0.24	0.08	0.29	−0.22	0.72
Marijuana use	−0.15	0.35	−0.03	0.67	−0.85	0.55
Varicocele	0.53	0.26	0.17	0.04	0.02	1.04

ANOVA test, P < 0.05.

^*Model Predictors: (1) Age ≥ 45 years, (2) Obesity [BMI ≥ 30 kg/m²], (3) Sedentary lifestyle, (4) Current tobacco smoking ≥ 10 year-pack, (5) Daily alcohol consumption ≥ 3 doses according to WHO (10), (6) Marijuana smoker [≥1× per week/1 year], (7) Presence of clinical varicocele.

BMI, body mass index; WHO, World Health Organization. Bold values mean P < 0.05.