Changes in autonomic nervous system activity, body weight, and percentage fat mass in the first year postpartum and factors regulating the return to pre-pregnancy weight

Table 5 Analysis of factors affecting the return to pre-pregnancy weight using a multivariable Cox proportional hazards model

	Factor	Category advantage/disadvantage	Partial regression coefficient	P value	Hazard ratio	95 % CI
SNS activity^a	First survey: 30–150 days after delivery	≦2.80/>2.81	−1.045	0.064	0.352	0.116 to 1.061
	Second survey: 150–270 days after delivery	≦2.10/>2.11	0.103	0.807	1.108	0.487 to 2.524
	Third survey: 270–360 days after delivery	≦2.00/>2.01	−0.987	0.069	0.373	0.129 to 1.079
PNS activity^a	First survey: 30–150 days after delivery	≦0.4/>0.41	−0.903	0.071	0.405	0.152 to 1.080
	Second survey: 150–270 days after delivery	≦0.4/>0.41	−0.675	0.168	0.509	0.195 to 1.329
	Third survey: 270–360 days after delivery	≦0.4/>0.41	−0.464	0.374	0.629	0.226 to 1.750
Exercise habits in pre-pregnancy		±	0.219	0.623	1.244	0.520 to 2.975
Parity		Primipara/multipara	0.437	0.289	1.548	0.691 to 3.467
BMI in pre-pregnancy		≦24/≧25	−1.246	0.164	0.288	0.050 to 1.666
Age		≦34/≧35	−0.381	0.302	0.683	0.332 to 1.408

95 % CI 95 % confidence interval
^aTP at 30–150 days was considered to be 100, and SNS and PNS activities were normalized by this value

ISSN: 1880-6805