Table 2.

Cumulative Clinical COVID-19 Attack Rates for Health System Employees by Sex, Race, and Quintiles of Workers’ Residential Community Cumulative Attack Rates, Excluding 29 Nonindex Employees Involved in Workplace Infection Clusters

Variable	Crude Rate	Rate per 100,000	Incident Rate Ratio (95% CI)	Median Community Rate per 100,000 (95% CI)a	Adjusted Incident Rate Ratio
Sex (n = 4,850)
Female	91/3641	2,499.31	1.21 (0.78–1.88)	1,627.51 (1,412.36–1,634.48)	1.15 (0.74–1.80)
Male	25/1209	2,067.83	1.0 Ref	1,390.02 (1,325.23–1,550.49)	1.0 Ref b
Race (n = 4,528)
Non–Hispanic white	38/2544	1,493.71	1.0 Ref	1,181.65 (1,152.36–1,218.63)	1.0 Ref c
African American	44/875	5,028.57	3.37 (2.18–5.20)	1,698.80 (1,698.80–1,755.19)	2.78 (1.78–4.33)
Hispanic	28/592	4,729.73	3.17 (1.94–5.16)	1,924.57 (1,850.46–1,930.59)	2.41 (1.42–4.07)
Other	6/517	1,160.54	0.78 (0.33–1.84)	1,390.02 (1,325.23–1,634.48)	0.70 (0.29–1.66)
Quintiles of employee residential community cumulative attack rates (n = 4,571)a
First quintile	17/1115	1,524.66	1.0 Ref	826.36 (826.36–826.36)	1.0 Ref d
Second quintile	7/731	957.59	0.63 (0.26–1.51)	1,112.81 (1,107.21–1,152.36)	0.59 (0.24–1.42)
Third quintile	31/1,089	2,846.65	1.87 (1.03–3.37)	1634.48 (1,634.48–1,634.48)	1.46 (0.80–2.66)
Fourth quintile	24/895	2,681.56	1.76 (0.94–3.27)	1,930.59 (1,930.59–1,930.59)	1.34 (0.71–2.52)
Fifth quintile	37/741	4,993.25	3.27 (1.84–5.82)	3,393.33 (3,393.33–3,393.33)	1.89 (1.03–3.44)

Note. CI, confidence interval.

^aLimited to those residing in the New England area.

^bAdjusted for age, race, residential area COVID-19 cumulative attack rate, and frontline or patient-facing working status.

^cAdjusted for age, sex, residential area COVID-19 cumulative attack rate, and frontline or patient-facing working status.

^dAdjusted for age, sex, race, and frontline/patient-facing working status.