Pandemic stress had more impact on pregnant women: Study

According to a new study, Covid-19-related stress had a larger impact on the mental health of pregnant women during the pandemic than on those who were not.

Dr Susanne Schweizer from UNSW Science, together with colleagues in Europe and the United States, collected data on mental health at several time periods during and after pregnancy in a longitudinal research of 742 pregnant individuals.

Their analysis found Covid-19 related stress had the greatest impact on pregnant people who had a tendency to worry, felt lonely, or had a low tolerance for uncertainty.

A follow-up study, published on Tuesday in JAMA Network Open, looked at Covid-19 related stress in the postpartum period, 1.5 years after the first investigation. The team found that feeling stressed about the pandemic during pregnancy not only had a lasting effect on participants' own mental health, but was also associated with an increase in negative mood in their infants.

"The Centre for Disease Control identifies pregnant women as a vulnerable group in terms of physical health during pandemics and disease outbreaks," says Dr Schweizer. "Based on these findings, and those of others, we should also identify pregnant women as a vulnerable group in terms of mental health."

Mental health vulnerability factors

Importantly, the research team compared the pregnant women who took part in the study to gender, age and country matched controls. "So, you have someone who's as similar as possible, but who isn't pregnant at that point in time. And we looked at the impacts of pandemic related stress on their mental health," says Dr Schweizer.

Pandemic stress was measured using the Pandemic Anxiety Scale, which measures individuals' concerns about the pandemic, including worries about contracting the virus, having enough food and job-related impacts.

Unsurprisingly, COVID-19 related stress was associated with more mental health problems in both women who were pregnant and those who weren't. "But not all women were affected in the same way. There were vulnerability factors, such as lack of social support, increased loneliness, worry and intolerance of uncertainty, which had a greater impact on mental health in the context of pandemic related stress in pregnant women, compared to their non pregnant counterparts," says Dr Schweizer.

Effect on infant behaviour

At the final timepoint, on average 18 months after the initial assessment, the team administered the same set of measures to the cohort.

"But this time, we also administered a measure on postpartum distress, which captures mental health symptoms that are related to the postpartum period, such as thoughts of harm befalling the child or inflicting harm on a child, and we also measured infant mood and behaviour."

The follow-up study found that Covid-19 related stress during pregnancy, captured in the first paper, was significantly associated with poor postpartum maternal mental health outcomes.

"What's always going to predict your mental health best is your mental health at a previous timepoint," says Dr Schweizer. "So I was surprised that pandemic related stress during pregnancy adversely impacted maternal depression, anxiety and distress that far into the future, even when we controlled for their previous levels of mental wellbeing."

But it wasn't just the mothers who were negatively impacted. For those who were stressed by the pandemic, there was a higher chance of what researchers call 'negative affectivity' in their infants.

Negative affectivity includes the infant being more likely to cry and less easily settled, as well as less likely to venture into an unknown situation.