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Volume 28, Number 8—August 2022
Research

Factors Associated with Delayed or Missed Second-Dose mRNA COVID-19 Vaccination among Persons >12 Years of Age, United States

Lu Meng, Neil Chandra Murthy, Bhavini Patel Murthy, Elizabeth Zell, Ryan Saelee, Megan Irving, Hannah E. Fast, Patricia Castro Roman, Adam Schiller, Lauren Shaw, Carla L. Black, Lynn Gibbs-Scharf, LaTreace Harris, and Terence ChorbaComments to Author 
Author affiliations: Centers for Disease Control and Prevention Atlanta, Georgia, USA (L. Meng, N.C. Murthy, B.P. Murthy, E. Zell, R. Saelee, M. Irving, H.E. Fast, P.Castro Roman, A. Schiller, L. Shaw, C.L. Black, L. Gibbs-Scharf, L. Harris, T. Chorba); General Dynamics Information Technology Inc., Falls Church, Virginia, USA (L. Meng, R. Saelee); Stat-Epi Associates, Inc., Ponte Vedra Beach, Florida, USA (E. Zell); Deloitte Consulting LLP, New York, New York, USA (M. Irving); Booz Allen Hamilton, Inc., McLean, Virginia, USA (A. Schiller)

Main Article

Table 1

Timing of second dose of a 2-dose primary mRNA COVID-19 vaccine series, by sociodemographic factors, United States, December 14, 2020–December 31, 2021*

Variable Second dose timing, no. (%)
 Total, no. (%)
Timely† Delayed‡ Missed§
Total
 135,979,226 (87.25)
 5,224,993 (3.35)
 14,643,23 (9.40)
 155,847,451
Vaccine type, dose 1
Moderna 53,478,853 (87.04) 2,384,368 (3.88) 5,577,569 (9.08) 61,440,790
Pfizer-BioNTech
 82,500,373 (87.39)
 2,840,625 (3.01)
 9,065,663 (9.60)
 94,406,661
Age group, y
12–17 9,762,549 (86.60) 280,348 (2.49) 1,230,395 (10.91) 11,273,292
18–39 39,414,160 (85.13) 1,621,400 (3.50) 5,264,452 (11.37) 46,300,012
40–64 52,589,787 (88.27) 1,934,658 (3.25) 5,053,236 (8.48) 59,577,681
>65
 34,212,730 (88.41)
 1,388,587 (3.59)
 3,095,149 (8.00)
 38,696,466
Sex
M 62,548,887 (86.85) 2,393,426 (3.32) 7,076,540 (9.83) 72,018,853
F
 73,430,339 (87.60)
 2,831,567 (3.38)
 7,566,692 (9.03)
 83,828,598
Urbanicity
Metro 120,443,535 (87.14) 4,633,895 (3.35) 13,145,421 (9.51) 138,222,851
Nonmetro
 15,535,691 (88.15)
 591,098 (3.35)
 1,497,811 (8.50)
 17,624,600
Social Vulnerability Index (12)
High 41,938,563 (85.92) 1,873,526 (3.84) 5,003,810 (10.25) 48,815,899
Medium 54,681,094 (86.36) 2,090,878 (3.30) 6,544,599 (10.34) 63,316,571
Low
 39,359,569 (90.04)
 1,260,589 (2.88)
 3,094,823 (7.08)
 43,714,981
Race/ethnicity
Hispanic 14,678,149 (83.38) 622,364 (3.54) 2,302,543 (13.08) 17,603,056
Black 9,711,675 (86.24) 446,893 (3.97) 1,102,700 (9.79) 11,261,268
American Indian/Alaska Native 860,111 (75.91) 54,520 (4.81) 218,355 (19.27) 1,132,986
Asian/OPI 6,047,962 (88.09) 210,615 (3.07) 607,609 (8.85) 6,866,186
White 58,829,793 (90.17) 1,972,730 (3.02) 4,445,116 (6.81) 65,247,639
Other/unknown
 45,851,536 (85.33)
 1,917,871 (3.57)
 5,966,909 (11.10)
 53,736,316
Region
South 41,188,846 (86.15) 1,775,680 (3.71) 4,844,461 (10.13) 47,808,987
Midwest 28,738,970 (91.57) 811,360 (2.59) 1,832,846 (5.84) 31,383,176
Mountain 11,446,355 (86.39) 574,949 (4.34) 1,227,706 (9.27) 13,249,010
Pacific 27,077,135 (83.19) 1,254,754 (3.86) 4,216,649 (12.95) 32,548,538
Noncontiguous 517,084 (74.17) 28,439 (4.08) 151,668 (21.75) 697,191
Northeast 27,010,836 (89.56) 779,811 (2.59) 2,369,902 (7.86) 30,160,549

*Pfizer-BioNTech, https://www.pfizer.com; Moderna, https://www.modernatx.com. OPI, other Pacific Islander. †Second dose administered <42 d after first dose. ‡Second dose administered >42 d after second dose. §Received the first dose but no matching second dose on record.

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Page created: June 22, 2022
Page updated: July 20, 2022
Page reviewed: July 20, 2022
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