Table 3 Odds ratios conditional to the participants’ country, base percentage, country additional effect, and cumulative effect in brackets.

From: Assessing the perceived effect of non-pharmaceutical interventions on SARS-Cov-2 transmission risk: an experimental study in Europe

NPI attribute

Base percentages

Additional country effect in percentages

France

Italy

Spain

Sweden

Bulgaria

Poland

Face mask [yes]

 − 34%***

 − 10%*** (− 44%)

 − 9%*** (− 43%)

 − 19%*** (− 53%)

 + 12%*** (− 22%)

 + 23%*** (− 11%)

 + 9%*** (− 25%)

Duration [15 min]

 − 5%***

 + 0.01%n.s

 + 0.02%n.s.

 + 0.001%n.s.

 + 0.01%n.s.

 + 0.0001%n.s.

 − 0.01%n.s.

Distance [about 1 m]

 + 9%***

 − 1%*** (+ 8%)

 − 4%*** (+ 5%)

 + 1%*** (+ 10%)

 + 8%*** (+ 17%)

 + 3%*** (+ 12%)

 − 0.2%*** (+ 9.2%)

Environment [outdoors, open air]

 − 35%***

 − 4%*** (− 39%)

 + 6%*** (− 29%)

 − 3%*** (− 38%)

 − 14%*** (− 49%)

 + 12% (− 22%)

 + 2%*** (− 33%)

People [2 people]

 − 13%***

 − 4%*** (− 17%)

 + 3%*** (− 10%)

 + 1%*** (− 12%)

 − 7%*** (− 20%)

 + 5%*** (− 8%)

 + 2%*** (− 11%)

  1. ***p < 0.000, **p < 0.001, *p < 0.05, n.sp > 0.05.