Table. Baseline Characteristics Among 17 525 Participantsa.
| Characteristic | Pregnant individuals (n = 7809) | Lactating individuals (n = 6815) | Individuals planning pregnancyb (n = 2901) | P value | |||
|---|---|---|---|---|---|---|---|
| Totalc | No. (%) | Totalc | No. (%) | Totalc | No. (%) | ||
| Vaccine | |||||||
| Pfizer-BioNTech BNT162b2 | 7770 | 4777 (61.5) | 6775 | 4156 (61.3) | 2886 | 1857 (64.4) | .02 |
| Moderna mRNA-1273 | 2970 (38.2) | 2596 (38.3) | 1026 (35.6) | ||||
| Janssen JNJ-78436735 | 23 (0.3) | 23 (0.3) | 3 (0.1) | ||||
| Dose 1 to survey completion, mean (SD), d | 7565 | 25 (15.4) | 6452 | 27.8 (14.8) | 2833 | 31.2 (16.8) | <.001 |
| Dose 2 to survey completion, mean (SD), d | 6232 | 10.1 (10.6) | 5863 | 11.1 (11.7) | 2440 | 12.9 (11.9) | <.001 |
| Age, mean (SD), y | 7804 | 33.4 (3.6) | 6814 | 34.1 (3.7) | 2900 | 32.7 (3.5) | <.001 |
| Gravidity, mean (SD) | 5236 | 2.1 (1.3) | 4614 | 2.1 (1.3) | 1943 | 2.1 (1.3) | .56 |
| Parity, mean (SD) | 5245 | 1.2 (1.0) | 4619 | 1.2 (1.0) | 1948 | 1.2 (1.0) | .67 |
| Trimester of pregnancy at dose 1 | |||||||
| First | 7611 | 1822 (23.9) | NA | NA | NA | NA | NA |
| Second | 3694 (48.5) | NA | NA | ||||
| Third | 2095 (27.5) | NA | NA | ||||
| Race and ethnicityd | |||||||
| American Indian or Alaska Native | 7809 | 58 (0.7) | 6815 | 67 (1.0) | 2901 | 17 (0.6) | .09 |
| Asian | 640 (8.2) | 489 (7.2) | 183 (6.3) | .002 | |||
| Black or African American | 103 (1.3) | 104 (1.5) | 44 (1.5) | .53 | |||
| Native Hawaiian or other Pacific Islander | 34 (0.4) | 32 (0.5) | 7 (0.2) | .26 | |||
| White | 6802 (87.1) | 5883 (86.3) | 2676 (92.2) | <.001 | |||
| Othere | 118 (1.5) | 68 (1.0) | 45 (1.6) | .01 | |||
| Hispanic ethnicity | 7751 | 463 (6.0) | 6761 | 444 (6.6) | 2881 | 194 (6.7) | .21 |
| Education | |||||||
| Some college or less | 7756 | 281 (3.6) | 6761 | 377 (5.6) | 2885 | 121 (4.2) | <.001 |
| Bachelor's degree (eg, BA, AB, BS) | 1929 (24.9) | 1823 (27.0) | 899 (31.2) | ||||
| Master's degree | 2565 (33.1) | 2342 (34.6) | 1034 (35.8) | ||||
| Doctorate or professional degree | 2981 (38.4) | 2219 (32.8) | 831 (28.8) | ||||
| Area of employment | |||||||
| Health care | 7633 | 5310 (69.6) | 6539 | 4750 (72.6) | 2812 | 2205 (78.4) | <.001 |
| Academics or science | 823 (10.8) | 675 (10.3) | 228 (8.1) | ||||
| Teaching or childcare | 434 (5.7) | 343 (5.2) | 118 (4.2) | ||||
| Office work or tech industry | 406 (5.3) | 204 (3.1) | 76 (2.7) | ||||
| Otherf | 660 (8.6) | 567 (8.7) | 185 (6.6) | ||||
| Influenza vaccine this last season | 7755 | 7529 (97.1) | 6776 | 6461 (95.4) | 2878 | 2732 (94.9) | <.001 |
| Tdap vaccine in current or recent pregnancy | |||||||
| Yes | 7662 | 1995 (26.0) | 6755 | 6218 (92.0) | NA | NA | NA |
| Plan to get | 59 (0.8) | NA | NA | ||||
| Don’t know | 4698 (61.3) | 138 (2.0) | NA | ||||
| No | 910 (11.9) | 399 (5.9) | NA | ||||
| Should individuals receive the COVID-19 vaccine? | If pregnant? | If lactating? | If planning for pregnancy? | ||||
| Yes | 7456 | 6153 (82.5) | 6466 | 6080 (94.0) | 2669 | 2520 (94.4) | NA |
| Depends on circumstances | 1300 (17.4) | 382 (5.9) | 148 (5.6) | ||||
| No | 3 (0) | 4 (0.1) | 1 (0) | ||||
Abbreviations: NA, not applicable; Tdap, tetanus, diphtheria, and acellular pertussis.
All variables are based on pregnancy status at enrollment.
Participants in the planning group were neither pregnant nor lactating.
Totals differ from overall group numbers owing to missing data for some individuals.
Categories are not mutually exclusive. Missing numbers indicate participants who selected “Prefer not to answer.”
Participants could select other if they did not choose outlined race and ethnicity categories or in addition to other race and ethnicity categories. Those who selected other were given the opportunity to specify their own category.
Other includes military personnel, first responders, and individuals working in agriculture, manufacturing, construction, service, hospitality, retail industries, and other areas of employment.