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. 2023 Jun 16;9:e44465. doi: 10.2196/44465

Table 5.

Interrater agreement for self-reported brand by dose compared with the Québec Vaccination Registry for all participants whose emergency department index visit occurred between March 24, 2020, and December 25, 2021.

Dose and self-reported vaccine brand Québec Vaccination Registry vaccine brand, n Cohen κa (95% CI)

Pfizer Moderna Astra Zeneca or Covishield Johnson & Johnson
1 0.80 (0.75-0.84)

Pfizer 645 19 <5 0

Moderna 11 137 0 0

AstraZeneca or Covishield <5 0 38 0

Johnson & Johnson 0 0 0 <5

Unknown, but vaccinated 29 6 <5 0
2 0.76 (0.70-0.83)

Pfizer 386 19 <5 0

Moderna 5 84 0 0

AstraZeneca or Covishield 0 0 9 0

Unknown, but vaccinated 16 5 0 0
3 0.59 (0.34-0.83)

Pfizer 24 <5 0 0

Moderna <5 7 0 0

Unknown, but vaccinated <5 <5 0 0

aCohen κ calculated without participants who answered “Unknown, but vaccinated” were 0.89 (95% CI 0.86-0.93) for first dose, 0.85 (95% CI 0.80-0.91) for second dose, and 0.70 (95% CI 0.43-0.97) for third dose.