. 2021 Feb 14;57:46–53. doi: 10.1016/j.annepidem.2021.02.006

Table A.2.

Associations* between community mitigation measures and rapid riser counties identification, overall and by urbanicity (n = 3142 U.S. counties) — United States, June 1–September 30, 2020.

Urbanicity category	Characteristics		Length of closure (days)					Mask mandate at reopening
Urbanicity category	Characteristics		0	1–29	30–50	51–59	>59	Yes	No
All	Total, No.	3,142 (100)	339	836	687	480	800	674	2,468
	Rapid riser (% of total)	1,112 (35.4)	59 (17.4)	351 (42.0)	258 (37.6)	201 (41.9)	243 (30.4)	240 (35.6)	872 (35.3)
	aPR^† (95% CI)P-value		1.45 (1.17 - 1.79)0.0005	2.19 (1.94 - 2.48)<0.0001	1.79 (1.58 - 2.04)<0.0001	1.61 (1.42 - 1.83)<0.0001	Ref	0.57 (0.51–0.63)<0.0001	Ref
							Ref		Ref
Large metropolitan	Total, No. (%)	436 (13.9)	3	105	61	94	173	174	262
	Rapid riser (% of total)	277 (63.5)	2 (66.7)	78 (74.3)	44 (72.1)	60 (63.8)	93 (53.8)	98 (56.3)	179 (68.3)
	aPR^† (95% CI)P-value		1.32 (0.62 - 2.81)0.4719	1.67 (1.43 - 1.96)<0.0001	1.36 (1.13 - 1.63)	1.40 (1.17 - 1.67)0.0002	Ref	0.68 (0.59–0.77)<0.0001	Ref
							Ref		Ref
Medium/small metropolitan	Total, No. (%)	730 (23.2)	56	178	163	128	205	187	543
	Rapid riser (% of total)	431 (59.0)	30 (53.6)	108 (60.7)	108 (66.3)	82 (64.1)	103 (50.2)	103 (55.1)	328 (60.4)
	aPR^† (95% CI)P-value		1.45 (1.17 - 1.79)0.0006	1.58 (1.37 - 1.82)<0.0001	1.45 (1.26 - 1.68)<0.0001	1.41 (1.21 - 1.64)<0.0001	Ref	0.72 (0.63–0.81)<0.0001	Ref
							Ref		Ref
Nonmetropolitan	Total, No. (%)	1,976 (62.9)	280	553	463	258	422	313	1663
	Rapid riser (% of total)	404 (20.4)	27 (9.6)	165 (29.8)	106 (22.9)	59 (22.9)	47 (11.1)	39 (12.5)	365 (21.9)
	aPR^† (95% CI)P-value		2.88 (1.92 - 4.32)<0.0001	4.67 (3.54 - 6.16)<0.0001	3.53 (2.64 - 4.70)<0.0001	1.92 (1.38 - 2.67)	Ref	0.33 (0.24–0.44)<0.0001	Ref
							Ref		Ref

* Associations adjusted for county population size

§ P-value< .05 determined statistical significance

^†

aPR = adjusted prevalence ratio; CI = confidence interval