Table 4 Stillbirth logistic regression GAM (model 3.1)

Heatwave (ref: 0)

1

0.77

0.69

0.86

0.14

<0.0001

Great Recession (continuous)

1.16

0.88

1.52

0.08

0.28

COVID (continuous)

1.14

0.93

1.39

0.07

0.21

Time (by month)

1.00

1.00

1.00

0.00

0.18

SSEP (/10 points)

0.90

0.87

0.93

0.06

<0.0001

Altitude (/100m)

0.99

0.97

1.00

0.01

0.13

Sex (ref: male)

Female

1.01

0.95

1.07

0.01

0.72

Urban (ref: rural)

Urban

1.06

0.99

1.12

0.03

0.08

Language region (ref: German)

French

1.14

1.06

1.22

0.07

<0.001

Italian

0.94

0.80

1.10

0.03

0.44

Maternal nationality (ref: Swiss)

Not Swiss

1.13

1.06

1.19

0.07

<0.001

Civil status (ref: married)

Single

1.38

1.29

1.47

0.18

<0.0001

Smooth variables

 Maternal age (years)

<0.0001

 Seasonality (month)

0.70

n=1,270,214