Variables		Pregnancy duration	BMI	Inter-pregnancy interval
Maternal age (y)	r	0.145	−0.214	0.073
Maternal age (y)	P	0.189	0.050	0.510
BMI (kg/m²)	r	−0.223		−0.245
BMI (kg/m²)	P	0.041		0.028
Gravidity	r	0.214	−0.103	−0.097
Gravidity	P	0.050	0.350	0.379
Parity	r	0.231	−0.092	0.097
Parity	P	0.034	0.406	0.379
Inter-pregnancy interval (m)	r	0.307	−0.245
Inter-pregnancy interval (m)	P	0.005	0.028
Sample I IL-6 levels (ng/ml)	r	−0.456	0.285	−0.273
Sample I IL-6 levels (ng/ml)	P	0.0003	0.008	0.012
Sample I TNF-α levels (ng/ml)	r	−0.569	0.303	−0.355
Sample I TNF-α levels (ng/ml)	P	0.0009	0.005	0.001
Sample I IL-10 levels (ng/ml)	r	−0.446	0.247	−0.464
Sample I IL-10 levels (ng/ml)	P	0.0002	0.023	0.000