Table 1.
Demographic and Baseline Characteristics of 414 Participants Enrolled and Randomized in Both Seasons of 2-Year Randomized Trial of Quadrivalent Non–Egg-based vs Egg-Based Licensed Influenza Vaccines According to Vaccines Received in Each Study Season
| Characteristic | IIV/IIV | ccIIV/ccIIV | ccIIV/RIV | RIV/ccIIV | RIV/RIV | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| n = 60 | n = 101 | n = 106 | n = 73 | n = 74 | ||||||
| n | % | n | % | n | % | n | % | n | % | |
| Demographic | ||||||||||
| ȃAge, mean, (SD), years | 46 | (11) | 46 | (11) | 46 | (11) | 47 | (11) | 46 | (11) |
| ȃAge group, years | ||||||||||
| ȃȃ18–44 | 22 | (37) | 42 | (42) | 44 | (42) | 28 | (38) | 30 | (41) |
| ȃȃ45–64 | 38 | (63) | 59 | (58) | 62 | (58) | 45 | (62) | 44 | (59) |
| ȃFemale | 54 | (90) | 83 | (82) | 87 | (82) | 58 | (79) | 56 | (78) |
| ȃWhite | 47 | (78) | 83 | (82) | 88 | (83) | 56 | (77) | 54 | (73) |
| ȃHispanic | 10 | (17) | 10 | (10) | 18 | (17) | 11 | (15) | 10 | (22) |
| ȃSite | ||||||||||
| ȃȃBaylor Scott & White Health | 41 | (68) | 55 | (54) | 61 | (58) | 57 | (78) | 56 | (76) |
| ȃȃKaiser Permanente Northwest | 19 | (32) | 46 | (46) | 45 | (42) | 16 | (22) | 18 | (24) |
| Baseline | ||||||||||
| ȃBody mass index, mean (SD) | 30 | (7) | 29 | (7) | 30 | (7) | 29 | (6) | 30 | (7) |
| ȃSubjective health status, mean (SD)a | 4 | (1) | 4 | (1) | 4 | (1) | 4 | (1) | 4 | (1) |
| ȃDiagnosed or treated for chronic medical condition during the past 12 months | 11 | (18) | 8 | (8) | 13 | (12) | 7 | (10) | 8 | (11) |
| ȃImmunosuppressive condition | 1 | (2) | 0 | (0) | 2 | (2) | 2 | (3) | 1 | (1) |
| ȃSmokerb | 4 | (6) | 5 | (5) | 3 | (3) | 2 | (3) | 6 | (8) |
| ȃPregnantc | 2 | (11) | 0 | (0) | 1 | (3) | 0 | (0) | 1 | (5) |
| ȃPrior influenza vaccination receiptd | ||||||||||
| ȃTotal vaccines received during the preceding 6 seasons, mean (SD)d | 6 | (1) | 6 | (1) | 6 | (1) | 6 | (1) | 6 | (1) |
Abbreviations: ccIIV, cell culture–based inactivated influenza vaccine (Flucelvax Quadrivalent); IIV, quadrivalent inactivated influenza vaccine (Fluzone Quadrivalent); RIV, recombinant-hemagglutinin IIV (Flublok Quadrivalent); SD, standard deviation.
Original answer choice converted to numeric scale where 5 = excellent and 1 = poor. Responses were missing for 5 participants.
Participant was considered a smoker if participant answered currently smokes every day or some days. Responses were missing for 5 participants.
Among 131 female participants with nonmissing responses.
Based on report of vaccination by participant interview or electronic medical record extraction.