Table 2. Correlations between other variables and prenatal fatigue (N = 271).

Correlation analysis was used to explore correlations between covariates, independent variables, and prenatal fatigue. A correlation coefficient of correlation analysis (r) with its p-value was used.

	r	p
Demographic covariates
Age	0.01	0.87
Prenatal BMI	0.004	0.949
Parity (primipara = 1, multipara = 0)	−0.069	0.255
Employment (employed = 1, unemployed = 0)	−0.035	0.566
Educational level (low = 1, middle = 2, high = 3)	−0.036	0.557
Hometown (Shanghai = 1, other places = 0)	−0.12	0.049
Clinical covariates
Gestational weeks	0.151	0.013
Depression (EPDS), scores	0.49	<0.001
Sleep quality (PSQI), scores	0.539	<0.001
Independent variables
TNF-α, ng/ml	0.21	<0.001
IL-1β, ng/ml	0.032	0.599
IL-6, ng/ml	0.134	0.027
IL-8, ng/ml	0.209	0.001

Notes.

r

correlation coefficient of correlation analysis

BMI

Body Mass Index

low

<college

middle

college or bachelor

high

>bachelor

TNF-α

tumor necrosis factor alpha

IL-1β/6/8

Interleukin-1β/6/8