Table 6 Correlation of various biomarkers with the results of the different questionnaires (Stress and coping inventory [SCI], COVID-19 pandemic questionnaire [CPQ] and Edinburgh Postnatal Depression Scale [EPDS]) at T1

SCI

 Stress caused by insecurity

  Correlation coefficient

0.014

0.056

0.146

− .302**

− .215*

  p (two-sided)

0.9

0.61

0.18

0.004

0.045

  N

87

86

86

87

87

 Stress caused by being overwhelmed

  Correlation coefficient

0.104

− 0.096

0.047

− .260*

− 0.204

  p (two-sided)

0.33

0.371

0.663

0.013

0.054

  N

90

89

89

90

90

 Stress caused by loss

  Correlation coefficient

0.1

− 0.168

− 0.009

− 0.033

− 0.159

  p (two-sided)

0.348

0.115

0.935

0.759

0.133

  N

90

89

89

90

90

 Total load of stress

  Correlation coefficient

0.098

− 0.083

0.085

− .288**

− .227*

  p (two-sided)

0.366

0.448

0.439

0.007

0.034

  N

87

86

86

87

87

 Stress symptoms

  Correlation coefficient

0.027

0.049

0.022

− .231*

− 0.202

  p (two-sided)

0.803

0.654

0.845

0.032

0.063

  N

86

85

85

86

86

 Concern scale

  Correlation coefficient

0.094

0.025

− 0.065

− 0.133

− 0.199

  p (two-sided)

0.379

0.817

0.548

0.212

0.061

  N

90

89

89

90

90

CPQ

 Concern over time scale

  Correlation coefficient

0.102

0.111

0.054

− .257*

− 0.167

  p (two-sided)

0.337

0.299

0.612

0.015

0.115

  N

90

89

89

90

90

 Impairment scale

  Correlation coefficient

0.027

0.001

0.018

− 0.102

− 0.097

  p (two-sided)

0.8

0.993

0.87

0.337

0.363

  N

90

89

89

90

90

 Overall concern scale

  Correlation coefficient

0.108

0.088

0.017

− .212*

− 0.196

  p (two-sided)

0.315

0.416

0.875

0.047

0.068

 N

88

87

87

88

88

EPDS

 Correlation coefficient

− 0.021

0.047

0.028

− .232*

− 0.046

 p (two-sided)

0.844

0.665

0.795

0.029

0.669

 N

89

88

88

89

89