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Table 1 Inclusion and exclusion criteria

From: Has vaccination alleviated the strain on hospitals due to COVID-19? A combined difference-in-difference and simulation approach

 

A) Confirmed COVID-19 (unvaccinated)

B) Confirmed COVID-19 (vaccinated)

C) Vaccinated

Study population

Age: 18-64

Norwegian residents

No COVID-19 prior to January 1st, 2021

Age: 18-64

Vaccinated with at least two doses

Norwegian residents

No COVID-19 prior to January 1st, 2021

Age: 18-64 

Norwegian residents

No COVID-19 prior to January 1st, 2021

Inclusion criteria for treatment group

Confirmed COVID-19 cases between January 1st 2021 and August 1st 2021

Confirmed COVID-19 cases at least 7 days after second vaccination dose between January 1st and September 1st 2021

Ten percenta of the individuals among the 20-40 percentile that got the vaccine first in the age categories:18-24, 25-39, 40-44, 45-64 b

Eligible for comparison group

The full study population, (except those in the treatment group)

The full study population (except those in the treatment group)

The full study population (except the vaccinated in the treatment group and the vaccinated among the 20 percentile)

Excluded individuals and observations

Individuals who died, emigrated or were vaccinated before (hypothetical) treatment date were excluded entirely (C=10 421, T= 57). Individuals that died, emigrated, vaccinated or tested positive for COVID-19 after the treatment date were observed only until the date of this event (Person days: 123 678).

Individuals who died, emigrated or tested positive for COVID-19 before (hypothetical) treatment date

(C=19, T=3).

Individuals that died, emigrated, vaccinated or tested positive for COVID-19 after the treatment date were observed only until the date of this event (Person days: 154).

Individuals who died, emigrated or tested positive for COVID-19 before (hypothetical)

treatment date (C=6 143, T= 770).

Individuals that died, emigrated, vaccinated or tested positive for COVID-19 after the treatment date were observed only until the date of this event (Person days: 976 482).

  1. aOnly look at 10 percent of this sample to minimize strain on the computing capacity, as the matching procedure is computer-intensive
  2. bThe treatment group only includes individuals in the 20-40 percentile that was vaccinated first in each age group as the 20 percent that was vaccinated first was more likely to be prioritized for vaccination due to risk factors. Additionally, we exclude the 40-100 percentile from the treatment group as these was included in the target set used to construct a comparison group