Table 2.
Demographics of pregnant and non-pregnant women by influenza test status1
| Pregnant women (N=3,539) | Non-pregnant women (N=57,709) | |||||||
|---|---|---|---|---|---|---|---|---|
| Total (col %) | Positive (row %) | Negative (row %) | SMD2 | Total (col %) | Positive (row %) | Negative (row %) | SMD2 | |
| Influenza vaccination status | 0.23 | 0.30 | ||||||
| Unvaccinated | 2,428 (68.6) | 784 (32.3) | 1,644 (67.7) | 43,826 (75.9) | 11,924 (27.2) | 31,902 (72.8) | ||
| Vaccinated | 1,111 (31.4) | 249 (22.4) | 862 (77.6) | 13,883 (24.1) | 2,114 (15.2) | 11,769 (84.8) | ||
| Time since vaccination | 0.19 | 0.30 | ||||||
| Median days (IQR) | 87 (54-128) | 89 (60-120) | 86 (52-132) | 100 (61-143) | 96 (68-127) | 100 (60-146) | ||
| 14-59 days | 314 (28.3) | 62 (19.7) | 252 (80.3) | 3,291 (23.7) | 407 (12.4) | 2,884 (87.6) | ||
| 60-119 days | 464 (41.8) | 122 (26.3) | 342 (73.7) | 5,369 (38.7) | 1,083 (20.2) | 4,286 (79.8) | ||
| ≥120 days | 333 (30.0) | 65 (19.5) | 268 (80.5) | 5,223 (37.9) | 624 (11.9) | 4,599 (88.1) | ||
| gestational age at vaccination | 0.15 | N/A | ||||||
| Median weeks (IQR) | 10 (1-17) | 10 (3-16) | 10 (1-17) | -- | -- | -- | ||
| Pre-pregnancy | 263 (23.7) | 50 (19.0) | 213 (81.0) | -- | -- | -- | ||
| ≤13 weeks | 465 (41.9) | 109 (23.4) | 356 (76.6) | -- | -- | -- | ||
| 14-27 weeks | 338 (30.4) | 83 (24.6) | 255 (75.4) | -- | -- | -- | ||
| ≥28 weeks | 45 (4.1) | 7 (15.6) | 38 (84.4) | -- | -- | -- | ||
| Site | 0.23 | 0.19 | ||||||
| A | 88 (2.5) | 23 (26.1) | 65 (73.9) | 1,907 (3.3) | 297 (15.6) | 1,610 (84.4) | ||
| B | 852 (24.1) | 288 (33.8) | 564 (66.2) | 11,279 (19.5) | 3,167 (28.1) | 8,112 (71.9) | ||
| C | 359 (10.1) | 109 (30.4) | 250 (69.6) | 8,725 (15.1) | 2,385 (27.3) | 6,340 (72.7) | ||
| D | 622 (17.6) | 138 (22.2) | 484 (77.8) | 8,882 (15.4) | 1,724 (19.4) | 7,158 (80.6) | ||
| E | 239 (6.8) | 95 (39.7) | 144 (60.3) | 3,491 (6.0) | 1,005 (28.8) | 2,486 (71.2) | ||
| F | 994 (28.1) | 274 (27.6) | 720 (72.4) | 14,619 (25.3) | 3,489 (23.9) | 11,130 (76.1) | ||
| G | 385 (10.9) | 106 (27.5) | 279 (72.5) | 8,806 (15.3) | 1,971 (22.4) | 6,835 (77.6) | ||
| Setting | 0.03 | 0.02 | ||||||
| Emergency department | 2,069 (58.5) | 615 (29.7) | 1,454 (70.3) | 31,210 (54.1) | 7,483 (24.0) | 23,727 (76.0) | ||
| Urgent care | 1,470 (41.5) | 418 (28.4) | 1,052 (71.6) | 26,499 (45.9) | 6,555 (24.7) | 19,944 (75.3) | ||
| Age category | 0.13 | 0.06 | ||||||
| Median years (IQR) | 30 (25-34) | 30 (26-34) | 29 (25-34) | 33 (26-41) | 34 (27-41) | 33 (26-41) | ||
| 18-24 years | 735 (20.8) | 179 (24.4) | 556 (75.6) | 12,083 (20.9) | 2,737 (22.7) | 9,346 (77.3) | ||
| 25-29 years | 998 (28.2) | 295 (29.6) | 703 (70.4) | 8,901 (15.4) | 2,090 (23.5) | 6,811 (76.5) | ||
| 30-34 years | 1,071 (30.3) | 340 (31.7) | 731 (68.3) | 10,216 (17.7) | 2,638 (25.8) | 7,578 (74.2) | ||
| 35-39 years | 578 (16.3) | 175 (30.3) | 403 (69.7) | 9,775 (16.9) | 2,476 (25.3) | 7,299 (74.7) | ||
| 40-49 years | 157 (4.4) | 44 (28.0) | 113 (72.0) | 16,734 (29.0) | 4,097 (24.5) | 12,637 (75.5) | ||
| Race/ Ethnicity | 0.12 | 0.06 | ||||||
| American Indian or Alaska Native | 19 (0.5) | 5 (26.3) | 14 (73.7) | 253 (0.4) | 71 (28.1) | 182 (71.9) | ||
| Asian | 218 (6.2) | 54 (24.8) | 164 (75.2) | 2,928 (5.1) | 692 (23.6) | 2,236 (76.4) | ||
| Black non-Hispanic | 350 (9.9) | 94 (26.9) | 256 (73.1) | 6,636 (11.5) | 1,647 (24.8) | 4,989 (75.2) | ||
| Hawaiian or Other Pacific Islander | 39 (1.1) | 14 (35.9) | 25 (64.1) | 569 (1.0) | 177 (31.1) | 392 (68.9) | ||
| Hispanic | 1,210 (34.2) | 372 (30.7) | 838 (69.3) | 16,905 (29.3) | 4,273 (25.3) | 12,632 (74.7) | ||
| Multi-race | 60 (1.7) | 12 (20.0) | 48 (80.0) | 888 (1.5) | 240 (27.0) | 648 (73.0) | ||
| Other non-Hispanic | 29 (0.8) | 5 (17.2) | 24 (82.8) | 555 (1.0) | 124 (22.3) | 431 (77.7) | ||
| Unknown | 131 (3.7) | 42 (32.1) | 89 (67.9) | 2,035 (3.5) | 505 (24.8) | 1,530 (75.2) | ||
| White non-Hispanic | 1,483 (41.9) | 435 (29.3) | 1,048 (70.7) | 26,940 (46.7) | 6,309 (23.4) | 20,631 (76.6) | ||
| Underlying medical conditions 3 | 0.21 | 0.19 | ||||||
| None | 3,059 (86.4) | 942 (30.8) | 2,117 (69.2) | 46,373 (80.4) | 12,051 (26.0) | 34,322 (74.0) | ||
| ≥1 Underlying Condition | 480 (13.6) | 91 (19.0) | 389 (81.0) | 11,336 (19.6) | 1,987 (17.5) | 9,349 (82.5) | ||
| Gestational age at encounter | 0.07 | N/A | ||||||
| Median weeks (IQR) | 19 (10-28) | 19 (11-29) | 19 (10-28) | -- | -- | |||
| ≤13 weeks | 1,206 (34.1) | 330 (27.4) | 876 (72.6) | -- | -- | |||
| 14-27 weeks | 1,368 (38.7) | 406 (29.7) | 962 (70.3) | -- | -- | |||
| ≥28 weeks | 965 (27.3) | 297 (30.8) | 668 (69.2) | -- | -- | |||
Abbreviation: IQR, interquartile range
1
Both pregnant and non-pregnant individuals were 18-49 years of age with documented female sex.
2
Standardized mean difference (SMD) >0.20 considered a meaningful difference between categorical variables.
3
Includes respiratory conditions (asthma, COPD, other lung conditions) and non-respiratory conditions (cardiovascular, neurological and musculoskeletal, hematologic, endocrine/metabolic, renal, gastrointestinal, hepatic disease, obesity, and underweight).