Table 4.

Summary of regression outcomes (full details in Supplementary files 3–5).

	R	R2	ΔR2	p Values
Covid-19 related stress
Step 1a	.22	.05	.05	.14
Step 2b	.59	.31	.26	<.005
Pregnancy-specific stress (PDQ)
Step 1a	.27	.08	.08	.004
Step 2b	.63	.39	.32	<.005
General stress (PSS)
Step 1a	.29	.08	.08	.16
Step 2b	.72	.51	.43	.03
Mental health (SF-12 mental component)
Step 1a	.34	.11	.11	<.005
Step 2c	.74	.54	.43	<.005
Physical health (SF-12 physical component)
Step 1a	.33	.11	.11	<.005
Step 2c	.48	.23	.12	<.005
Health promoting behaviours
Step 1a	.32	.10	.10	<.005
Step 2c	.49	.25	.15	<.005
Health impairing behaviours
Step 1a	.35	.12	.12	<.005
Step 2c	.41	.17	.05	<.005

^aVariables entered at Step 1: age, parity, gestational age, country of residence, relationship status, education, previous pregnancy loss.

^bVariables entered at Step 2: Stress measures, Mental and physical health measures, social support.

^cVariables entered at Step 2: Stress measures, health measures, social support PSS = Perceived Stress Scale PDQ = Prenatal Distress Questionnaire SF-12 = SF-12® Health Survey.