TABLE 3—
Influenza Vaccination Coverage, by Gestational Age at Enrollment, for Pregnant Women Randomized to Text Message Reminders Vs Usual Care: New York, NY, 2011
| Gestational Age at Start Date Based on EDD/Review Date | Cumulative by September 30 | P | Cumulative by October 31 | P | Cumulative by November 30 | P | Cumulative by December 31 | P |
| 14–27 wk | .73 | .34 | .38 | .47 | ||||
| Intervention, no. (%) | 29 (14.9) | 99 (51.0) | 112 (57.7) | 117 (60.3) | ||||
| Usual care, no. (%) | 39 (16.2) | 112 (46.5) | 129 (53.5) | 137 (56.8) | ||||
| Absolute difference (95% CI) | −1.2% (−8.5, 6.1) | 4.6 (−5.3, 14.5) | 4.2 (−5.6, 14.1) | 3.5 (−6.3, 13.2) | ||||
| RR (95% CI) | 0.92 (0.59, 1.44) | 1.10 (0.91, 1.33) | 1.08 (0.91, 1.28) | 1.06 (0.91, 1.24) | ||||
| 28–33 wk | .049 | .009 | .03 | .029 | ||||
| Intervention, no. (%) | 39 (28.1) | 80 (57.6) | 84 (60.4) | 86 (61.9) | ||||
| Usual care, no. (%) | 26 (18.2) | 60 (42.0) | 68 (47.6) | 70 (49.0) | ||||
| Absolute difference (95% CI) | 9.9 (−0.6, 20.4) | 15.6 (3.4, 27.8) | 12.8 (0.63, 25.1) | 12.9 (0.71, 25.1) | ||||
| RR (95% CI) | 1.54 (0.996, 2.39) | 1.37 (1.08, 1.74) | 1.27 (1.02, 1.58) | 1.26 (1.02, 1.56) | ||||
| ≥ 34 wk | .095 | .82 | .92 | .79 | ||||
| Intervention, no. (%) | 43 (17.7) | 73 (30.0) | 77 (31.7) | 81 (33.3) | ||||
| Usual care, no. (%) | 23 (11.9) | 56 (29.0) | 62 (32.1) | 62 (32.1) | ||||
| Absolute difference (95% CI) | 5.8 (−1.3, −12.9) | 1.0 (−8.1, 10.1) | −0.4 (−9.7, −8.8) | 1.2 (−8.1, −10.5) | ||||
| RR (95% CI) | 1.49 (0.93, 2.38) | 1.04 (0.77, 1.39) | 0.99 (0.75, 1.30) | 1.04 (0.79, 1.36) |
Note. CI = confidence interval; EDD = estimated date of delivery; RR = relative rate.