Decline in seminal quality in Indian men over the last 37 years

Table 4 Correlation and regression analysis between time and seminal parameter levels in Indian fertile and infertile men

Variables	Fertile				Infertile				Total
Variables	n	r	b	p value (t_b)	n	r	b	p value (t_b)	n	r	b	p value (t_b)
Semen volume	53	0.12	0.012	0.408	22	0.06	0.020	0.778	75	0.10	0.015	0.391
Sperm concentration	112	−0.17	−0.635	0.071	59	−0.25^*	−1.467	0.060	171	−0.25^***	−1.270	< 0.001
Total motility	89	0.10	0.133	0.371	44	−0.30^*	−1.112	0.046	133	−0.14	−0.350	0.103
RLPM	30	−0.23	−0.570	0.232	21	−0.40	−1.191	0.073	51	−0.26	−0.903	0.066
Normal morphology	62	−0.39^**	−1.030	0.002	35	−0.29	−1.181	0.090	97	−0.39^***	−1.272	< 0.001
Viability	30	0.00	0.003	0.989	14	−0.35	−0.672	0.213	44	−0.14	−0.282	0.362

*- p < 0.05, **- p < 0.01, ***- p < 0.001. n = number of observations, r = correlation value, b = regression coefficient value, RLPM: rapid linear progressive motility

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