Psychological distress during the COVID-19 pandemic in France: a national assessment of at-risk populations

Participants

The study was conducted in France between 31 March 2020 and 7 April 2020. The participants were users of the four different Vik chatbots. They were contacted online to participate in a survey assessing their level of stress during the COVID-19 crisis. The inclusion criteria were to be of legal age and to have breast cancer, asthma, migraine or depression. The exclusion criteria were users who were unable to formulate their non-opposition, who had insulted the chatbot, who had dialogues that made no sense or users with uncompleted questionnaires.

Intervention

A self-report questionnaire, the PDI, was used. PD is defined as the emotional and physiological distress experienced during and/or immediately after a traumatic event.8 9 It is the standard tool designed to assess psychological distress in times of crisis.26 It consists of 13 questions rated from 0 (not at all true) to 4 (extremely true). It explores the frequency of anxiety, depression, specific phobias, cognitive changes, avoidance and compulsive behaviours, physical symptoms and loss of social interaction in patients in the past one week. The total score, ranging from 0 to 52, is the sum of all items. A score greater than or equal to 14 indicates significant distress. The French validation of the PDI has a good internal cohesion, with a Cronbach’s alpha of 0.83.26

Data collection

The PDI questionnaire was presented to the participants by text messages. Users were asked to click on a button corresponding to the score they wished to give their status. There was no actual conversation per question, nor was there a need for natural language processing for each question. Classical demographic information (age, sex, city and professional profile), level of knowledge and use of internet tools and the presence or absence of symptoms related to COVID-19 were also assessed.

Ethical and regulatory issues

Participants were not paid. The collected data were anonymised and then hosted by Wefight on a server that meets the requirements for storing health data. Consent was collected online before the start of the study. This study was registered in the ClinicalTrials.gov database. In accordance with French and European laws on information technology and liberties (Commission Nationale Informatique et Libertés, registration n° 2217452, General Regulations for Data Protection), users had the right to access the data to verify its accuracy and, if necessary, to correct, complete and update it. They also had a right to object to the use of their data and a right to delete such data. The general conditions for the use of the data were presented and explained very clearly. They had to be accepted before accessing the questionnaire.

Statistical analysis

The description of the included populations was carried out using conventional statistical tools. For the quantitative variables we used the calculation of the mean, the standard deviation (SD), the median and the quartiles. For the qualitative variables we used numbers and percentages with 95% confidence intervals (CI). The population density was defined by French Government’s Direction of evaluation, prospection and performance.27

Analysis of variance (ANOVA) was performed to detect patients’ attributes with a significant effect on PDI, which is set as the only dependent variable. In addition, a binomial logistic regression analysis was carried out to determine the patients’ features associated with a PDI ≥14, because this subpopulation is at a higher risk of partial or full PTSD 6 weeks after the traumatic event.9 A binomial variable is built splitting PDI >14 and PDI ≤14 and set as the dependent variable. For both analyses, independent variables are participant’s group (breast cancer, asthma, depression and migraine), age (18–24, 25–34, 35–44, 45–54, 55–64 and ≥65 years), sex (male or female), profession (employed, unemployed and other), smartphone/computer usage (<1 hour a day, 1–6 hours and >6 hours a day) a day and population density (low, medium or high).

PDI items were grouped into two factors that have been shown to better reflect and predict PD and PTSD: negative emotions (items 1, 2, 3, 5, 6, 8 and 10) and perceived life threat and bodily arousal (items 4, 7, 9, 11, 12 and 13). For those groups of factors, an ANOVA was performed with the same independent variables as before and the patient’s mean rate for each group of items as the dependent variable. The Pearson correlation coefficient was calculated between the average PDI and the number of infected people in each French region and was tested to be equal to 0.

Cohort description

The study included 2593 participants. We excluded 822 of them because they were not eligible (incomplete questionnaires and age requirements). The total sample size was 1771 (responding rate=72.9%) (figure 1). Overall, 91.25% (n=1616) were female with a mean age of 32.8 (13.71) years, 7.96% (n=141) were male with a mean age of 28.0 (8.14) years and 0.79% (n=14) were ‘other’ with a mean age of 25.6 (8.85) years (table 1). In total, 3.3% (n=58) of participants were using a smartphone or computer less than an hour a day, 55.5% (n=983) for more than 1 hour but less than 6 hours a day and 41.22% (n=730) more than 6 hours a day. 87.86% (n=1556) had been using the internet for more than 5 years. During the survey period, 25.86% (n=458) were working as usual, 27.67% (n=490) were unemployed, 22.92% (n=406) were teleworking and 23.55% (n=417) were unemployed due to the pandemic and containment measures. Professional profiles are detailed in table 1. Regarding the population density, 7.4% (n=131) of participants were in a low (rural), 19% (n=335) in a medium (urban) and 73.7% (n=1305) in a high population density area.

Request permission

A total of 27.83% (n=493) declared they had symptoms of COVID-19, twenty-one participants tested positive, 11 negative and 461 were not tested. Of the 1771 respondents, 61.66% (n=1092) would have liked to be screened for COVID-19.

The four groups included 497 patients with asthma (from the ‘Vik Asthma’ chatbot), 360 patients with breast cancer (from the ‘Vik Breast’ chatbot), 459 patients with depressive disorder (from the ‘Vik Depression’ chatbot) and 455 from the Vik Migraine group.

Findings

The global mean PDI score was 13.48 (8.02). Median PDI was 127–18 for patients with asthma, 106–16 for patients with breast cancer, 1410–21 for patients with depressive disorder and 117–17 for patients with migraine (figure 2). Scores for each item are shown in table 2.

Request permission

In total, 38.06% (674) of the respondents had psychological distress (score ≥14). Prevalence of PD was 42% for patients with asthma (209/497), 34% for patients with breast cancer (123/360), 54% for patients with depressive disorder (246/459) and 39% for patients with migraine (178/455).

The ANOVA analysis showed that sex (F=−3.217, p=0.001), unemployment (F=4.503,p<0.001) and depression (F=4.966, p<0.001) were significantly associated with a higher PDI score.

Patients using their smartphones or computers more than 1 hour a day also had a higher PDI score (F=−2.230, p=0.026).

Binomial logistic regression shows that patients with depression had a 53% (OR: 1.53, 95%CI: 1.18 to 1.99) increased risk (Z=3.207, p=0.001) of developing PD, while patients under 34 years of age had a 72% (OR: 1.72, 95% CI: 1.04 to 2.89) increased risk (Z=2.094, p=0.036), women had a 63% (OR: 1.63, 95% CI: 1.12 to 2.38) increased risk (Z=2.549, p=0.011) and unemployed patients had a 38% (OR: 0.38, 95% CI: 1.12 to 1.71) increased risk (Z=3.033, p=0.002).

PDI was significantly higher in regions with higher COVID-19 prevalence (F=2.263, p=0.024) (Pearson correlation coefficient=0.58) (figure 3).

Request permission

The negative emotions factor was significantly associated with depression (F=6.705, p<0.001), age higher than 65 years (F=2.288, p=0.022), being a woman (F=2.816, p=0.004), living in a low population density area (F=2.478, p=0.013), being unemployed (F=4.845, p<0.001) and using a smartphone or computer more than 6 hours a day (F=2.105, p=0.035).

The life threat and bodily arousal factor was significantly associated with depression (F=4.689, p<0.001), being younger than 34 years of age (F=2.416, p=0.015), being a woman (F=2.942, p=0.003), living in a low population density area (F=2.755, p=0.005) and being unemployed (F=2.553, p=0.010).

Main findings

The first case of COVID-19 was diagnosed in December 2019 in Wuhan, China, and has since brought unprecedented efforts from governments all over the world to limit its spread. These steps have included social distancing and global shutdowns. Their precise consequences on mental health are still unknown. It is currently considered that the risk for mental health is outweighed by the need to prevent infections. The available literature on the mental health consequences of pandemics are more focused on the sequelae of the infection; however, other catastrophic events, such as the World Trade Centre terrorist attacks, were followed by an increase in depression and PTSD cases, substance abuse, domestic violence and child abuse.28 In that regard, the 2006 SARS epidemic also induced an increase in PD and PTSD in patients and clinicians.29 COVID-19 could also have the same effect, specifically because of the strong mitigation strategies that have been enforced all over the world, on a scale never seen before, and the major economic disruptions it has induced.30

The aim of our study was to quantify PD on a national scale in a country that has been hard-hit by COVID-19. We used a chatbot-administered standardised and a validated tool specifically designed to rate PD, the Psychological Distress Inventory.8 We showed that, in four groups of patients at-risk to develop PD and PTSD, the prevalence of psychological distress was 38.06% (n=674). These patients are also at high risk to develop partial of full PTSD 6 weeks after the evaluation, as shown by Bunnell et al.9 Within those four groups of patients, women, unemployed (p<0.001) and depressed (p<0.001) patients had significantly higher PDI score. Interestingly, patients using their smartphones or computers more than 1 hour a day also had a higher PDI score (p=0.026). This could also highlight the potential negative psychological impact of information and/or social networks in the context of such an event.

Limitations

There are limitations that should be considered when interpreting our results: first, a majority of participants were women (91.25%). This is due in part to the fact that one of the four groups explored consisted of patients with breast cancer, but it could also show that men are less likely to participate in this kind of online self-reported survey. This fact could potentially bias the results and specifically the value of the features we found to be associated with a PDI over 14 (predictive of PTSD). Another limitation is due to the sampling technique itself, relying on groups of patients already using the chatbots, excluding patients not using them. This study still holds interesting results because of the large cohort of respondents, the adequate geographical spread across France and the sampling time frame that corresponds to the pandemic peak in France. Another limitation is the lack of baseline measures for these cohorts: for example, we can only show that patients with depression had a higher PDI score during the COVID-19 crisis, without concluding that this is directly related to COVID-19.

Other studies have been conducted to measure the impact of COVID-19 among the general population. In Italy, Rossi et al 31 conducted a web-based survey on 18 147. They found high rates of negative mental health outcomes 3 weeks into the COVID-19 lockdown: 37% of the participants declared they had symptoms of PTSD, 17.3% of depression and 20.8% of anxiety. Like in our study, the majority of respondents were women (79.6%).

Implications

Overall, policy makers are rightfully concerned by the potential negative effects of COVID-19 on public health, beyond the pandemic itself. In the UK, psychological first aid guidance has been issued by Mental Health UK.32 In France, several psychological support hotlines have been created for healthcare professionals33 and the general public.34 The precise mental health sequelae of the pandemic are still unknown but should not be neglected. In the coming weeks, months and years, we need to thoroughly investigate these consequences to be able to correctly address them. Specific efforts should be made to lower the risk of PD, depression, suicide, substance abuse and domestic violence; otherwise, the long-term consequences of the COVID-19 pandemic could be even more dire, should they remain unexplored, unaddressed and ultimately forgotten.