Table 1.
Participant Characteristics
| Year | 1 | 2 | 3 | 4 | Years 1-4 | ||
|---|---|---|---|---|---|---|---|
| n=35 | n=50 | n=68 | TIV or H1N1 (n=86) (Seasonal: n=78) (H1N1: n=51) | TIV Only (n=35) | TIV and H1N1 (n=43) | n=239 | |
| Maternal age (years) | 26.5 (6.4) | 24.6 (5.0) | 24.6 (5.5) | 25.7 (6.2) | 25 (5.3) | 26.7 (6.9) | 25.4 (5.9) |
| Race | |||||||
| White | 3 (8.6) | 1 (2.0) | 8 (11.8) | 7 (8.1) | 2 (5.7) | 5 (11.6) | 19 (8.0) |
| Black | 11 (31.4) | 20 (40.0) | 28 (41.2) | 26 (30.2) | 13 (37.1) | 10 (23.3) | 85 (35.6) |
| Latina | 17 (48.6) | 25 (50.0) | 26 (38.2) | 49 (57.0) | 18 (51.4) | 26 (60.5) | 117 (49) |
| American Indian | 2 (5.7) | 1 (2.0) | 3 (4.4) | - | - | - | 6 (2.5) |
| Asian | 1 (2.9) | 1 (2.0) | 1 (1.5) | 2 (2.3) | 1 (2.9) | 1 (2.3) | 5 (2.1) |
| Other | 1 (2.9) | 2 (4.0) | 2 (2.9) | 2 (2.3) | 1 (2.9) | 1 (2.3) | 7 (2.9) |
| Education | |||||||
| Less than high school | 13 (37.1) | 22 (44.0) | 14 (20.6) | 26 (30.2) | 9 (25.7) | 15 (34.9) | 75 (31.4) |
| Finished high school | 5 (14.3) | 7 (14.0) | 17 (25.0) | 17 (19.8) | 10 (28.6) | 7 (16.3) | 46 (19.3) |
| More than high school | 17 (48.6) | 21 (42.0) | 37 (54.4) | 43 (50.0) | 16 (45.7) | 21 (48.8) | 118 (49.4) |
| Marital status | |||||||
| Married or living with partner | 23 (65.7) | 21 (42.0) | 40 (58.8) | 45 (52.3) | 16 (45.7) | 24 (55.8) | 129 (54.0) |
| Divorced, widowed, separated, single, and never married | 12 (34.3) | 29 (58.0) | 28 (41.2) | 41 (47.7) | 19 (54.3) | 19 (44.2) | 110 (46.0) |
| Parity | |||||||
| 0 | 14 (40.0) | 20 (40.0) | 28 (41.2) | 43 (50.0) | 17 (48.6) | 22 (51.2) | 105 (43.9) |
| 1 | 13 (37.1) | 13 (26.0) | 23 (33.8) | 21 (24.4) | 9 (25.7) | 9 (20.9) | 70 (29.3) |
| 2 or more | 8 (22.9) | 17 (34.0) | 17 (25.0) | 22 (25.6) | 9 (25.7) | 12 (27.9) | 64 (26.78) |
| Spontaneous abortions | |||||||
| 0 | 23 (65.7) | 36 (72.0) | 53 (77.9) | 62 (72.1) | 25 (71.4) | 31 (72.1) | 174 (72.8) |
| 1 | 8 (22.9) | 10 (20.0) | 11 (16.2) | 15 (17.4) | 7 (20) | 7 (16.3) | 44 (18.4) |
| 2 or more | 4 (11.4) | 4 (8.0) | 4 (5.9) | 9 (10.5) | 3 (8.6) | 5 (11.6) | 21 (8.8) |
| Induced abortions | |||||||
| 0 | 24 (68.6) | 27 (54.0) | 36 (52.9) | 43 (50.0) | 15 (42.9) | 24 (55.8) | 130 (54.4) |
| 1 | 6 (17.1) | 14 (28.0) | 17 (25.0) | 21 (24.4) | 9 (25.7) | 9 (20.9) | 58 (24.3) |
| 2 or more | 5 (14.3) | 9 (18.0) | 15 (22.1) | 22 (25.6) | 11 (31.4) | 10 (23.3) | 51 (21.4) |
| BMI (kg/m2)* | |||||||
| Less than 18 | 1 (2.9) | 4 (8.7) | 3 (4.5) | 2 (2.4) | 1 (2.9) | 1 (2.3) | 10 (4.3) |
| 18-24.9 | 12 (34.3) | 15 (32.6) | 33 (49.3) | 38 (44.7) | 16 (47.1) | 19 (44.2) | 98 (42.1) |
| 25-29.9 | 8 (22.9) | 13 (28.3) | 16 (23.9) | 22 (25.9) | 9 (26.5) | 13 (30.2) | 59 (25.3) |
| Greater than 30 | 14 (40.0) | 14 (30.4) | 15 (22.4) | 23 (27.1) | 8 (23.5) | 10 (23.3) | 66 (28.3) |
| Pregnancy-induced hypertension | 1 (2.9) | 3 (6.0) | 3 (4.4) | 5 (5.8) | 1 (2.9) | 3 (7) | 12 (5.0) |
| Gestational diabetes | 3 (8.6) | 2 (4.0) | 1 (1.5) | 4 (4.7) | 1 (2.9) | 3 (7) | 10 (4.2) |
| Preeclampsia | 1 (2.9) | 5 (10.0) | 4 (5.9) | 9 (10.5) | 2 (5.7) | 5 (11.6) | 19 (8.0) |
| Preterm delivery | 3 (8.6) | 5 (10.0) | 4 (5.9) | 2 (2.3) | - | 1 (2.3) | 14 (5.9) |
| Gestational age at delivery | 38.4 (2.7) | 37.5 (3.5) | 38.4 (2.5) | 38.2 (2.9) | 38.3 (2.2) | 38.2 (3.3) | 38.2 (2.9) |
| Asthma (ever) | 9 (25.7) | 10 (20.0) | 10 (14.7) | 23 (26.7) | 9 (25.7) | 10 (23.3) | 52 (21.8) |
| Depression | 6 (17.1) | 10 (20.0) | 15 (22.4) | 11 (12.8 | 4 (11.4) | 6 (14) | 42 (17.7) |
TIV, trivalent inactivated influenza vaccine; BMI, body mass index.
Data are n (%).
*
Based on self-reported prepregnancy weight. Five patients did not report a prepregnancy weight, so the earliest recorded first-trimester weight in the prenatal record was utilized to assign a BMI category.