Table 1.
Baseline Demographic Characteristics for the Human Immunodeficiency Virus–Uninfected Participants Included in the Immunogenicity Subset Cohort and Scheduled Visits Time-points
| Characteristic | Overall | IIV | Placebo | P Value |
|---|---|---|---|---|
| Mean age, y (SD) | 26.4 (5.4) [321] |
26.4 (5.4) [161] |
26.4 (5.4) [160] |
.977 |
| Mean body mass index, kg/m2 (SD) | 28.7 (5.6) [259] |
29.4 (5.8) [127] |
28.1 (5.4) [132] |
.056 |
| Mean gestational age, wk (SD) | 27.0 (4.4) [321] |
26.9 (4.4) [161] |
27.1 (4.4) [160] |
.790 |
| Nulliparous, No. (12) | 126 (39.3) [321] |
63 (39.1) [161] |
63 (39.4) [160] |
.964 |
| Primigravida, No. (12) | 96 (29.9) [321] |
52 (32.3) [161] |
44 (27.5) [160] |
.348 |
| Mean days after vaccination of first postvaccination immunogenicity visit (SD) | 30.4 (5.4) [306] |
30.2 (5.2) [152] |
30.6 (5.6) [154] |
.538 |
| Mean days after vaccination of second postvaccination immunogenicity visit (SD) | 94.0 (39.8) [293] |
92.7 (42.9) [150] |
95.5 (36.3) [143] |
.551 |
| Mean days after vaccination of third postvaccination immunogenicity visit (SD) | 249.9 (37.8) [297] |
248.2 (36.8) [149] |
251.6 (38.9) [148] |
.443 |
| Mean days between first and second postvaccination immunogenicity visits (SD)a | 71.4 (35.4) [241] |
71.3 (39.5) [120] |
71.4 (31.1) [121] |
.983 |
| Mean days between second and third postvaccination immunogenicity visits (SD)a | 159.5 (20.7) [269] |
157.6 (24.0) [138] |
161.6 (16.3) [131] |
.117 |
| Delivery <37 wk gestational age, No. (12) | 23 (7.9) [291] |
13 (8.8) [147] |
10 (6.9) [144] |
.548 |
| Median birth weight, kg, (range) | 3.1 (1.5–4.8) [291] |
3.1 (2.0–4.1) [147] |
3.2 (1.5–4.8) [144] |
.177 |
Numbers in brackets represent the number of participants with available information.
Abbreviations: IIV, trivalent inactivated influenza vaccine; SD, standard deviation.
aOnly participants who had their scheduled visits at least 21 days apart.