Table 3 Negative binomial fixed-effects results for the adjusted intensity ratio estimates, 95% confidence intervals (CI), and the p-value

Setting

 Correctional facility

ref.

ref.

 Acute care

0.51 (0.44–0.59)

< 0.0001

 Childcare

0.58 (0.51–0.66)

< 0.0001

 Industrial/agricultural

0.52 (0.45–0.59)

< 0.0001

 Long-term care facility

0.56 (0.48–0.64)

< 0.0001

 School

0.46 (0.40–0.53)

< 0.0001

 Retirement residence/assisted living

0.50 (0.44–0.57)

< 0.0001

 Other congregate living

0.50 (0.43–0.58)

< 0.0001

Variant period

 Pre-Delta

ref.

ref.

 Delta

1.43 (1.38–1.49)

< 0.0001

 Omicron

2.17 (2.05–2.30)

< 0.0001

Stringency index

1.13 (1.11–1.14)

< 0.0001

Vaccination coverage

0.88 (0.87–0.90)

< 0.0001

Number at risk

1.13 (1.12–1.14)

< 0.0001

Median age

1.13 (1.10–1.15)

< 0.0001