. 2023 Apr 13;141(5):441–447. doi: 10.1001/jamaophthalmol.2023.0610

Table 1. Propensity Score Matching Results Between First- and Second-Dose COVID-19 Vaccine Cohort.

Characteristic	Before matching			After matching
	COVID-19 dose, No. (%)		SMD	COVID-19 dose, No. (%)		SMD
	First (n = 3 108 829)	Second (n = 1 180 006)	SMD	First (n = 1 180 006)	Second (n = 1 180 006)	SMD
Age at vaccination, mean (SD), y	50.7 (20.4)	52.2 (20.6)	0.074	52.2 (20.6)	52.2 (20.6)	<0.001
Sex^a
Female	1 753 009 (56.4)	660 796 (56.0)	0.008	660 796 (56.0)	660 796 (56.0)	<0.001
Male	1 354 008 (43.6)	518 105 (43.9)	0.007	518 119 (43.9)	518 3105 (43.9)	<0.001
Ethnicity^b
Hispanic or Latinx	296 919 (9.6)	162 950 (13.8)	0.133	162 929 (13.8)	162 950 (13.8)	<0.001
Not Hispanic or Latinx	1 812 998 (58.3)	882 568 (74.8)	0.355	882 589 (74.8)	882 568 (74.8)	<0.001
Unknown	998 912 (32.1)	134 488 (11.4)	0.519	134 488 (11.4)	134 488 (11.4)	<0.001
Race^b
Asian	136 455 (4.4)	72 120 (6.1)	0.077	72 109 (6.1)	72 120 (6.1)	<0.001
Black or African American	370 356 (11.9)	179 490 (15.2)	0.096	179 498 (15.2)	179 490 (15.2)	<0.001
Native Hawaiian or Pacific Islander	5053 (0.2)	2362 (0.2)	0.009	2344 (0.2)	2362 (0.2)	<0.001
White	2 001 510 (64.4)	773 904 (65.6)	0.025	773 925 (65.6)	773 904 (65.6)	<0.001
Unknown	578 694 (18.6)	144 904 (12.3)	0.176	144 928 (12.3)	144 904 (12.3)	<0.001
Comorbidities
Diabetes	384 601 (12.4)	147 591 (12.5)	0.004	147 550 (12.5)	147 591 (12.5)	<0.001
Hypertension	871 147 (28.0)	332 131 (28.1)	0.003	332 095 (28.1)	332 131 (28.1)	<0.001
Hyperlipidemia	623 080 (20.0)	220 112 (18.7)	0.035	220 071 (18.6)	220 112 (18.7)	<0.001

Abbreviation: SMD, standardized mean difference.

^{^a}

Some data not reported.

^{^b}

Race and ethnicity were determined based on the presence of these designations within the electronic health record.