TABLE 3

Characteristics of Low Birth Weight Children, Their Mothers, and Their Health Care Providers According to Influenza Immunization Status (N = 45 012)

CharacteristicnInfluenza Vaccination Status
Fully Vaccinated (n = 3711)Partially Vaccinated (n = 3937)Not Vaccinated (n = 37 364)
Birth wt category
 <1000 g1867274 (14.7%)273 (14.6%)1320 (70.7%)
 1000–1499 g4161489 (11.8%)499 (12.0%)3173 (76.3%)
 1500–1999 g9147823 (9.0%)835 (9.1%)7489 (81.9%)
 2000–2499 g29 8372125 (7.1%)2330 (7.8%)25 382 (85.1%)
Gender
 Female23 4361882 (8.0%)2009 (8.6%)19 545 (83.4%)
 Male21 5761829 (8.5%)1928 (8.9%)17 819 (82.6%)
Multiple birth
 No32 2992483 (7.7%)2765 (8.6%)27 051 (83.8%)
 Yes12 7131228 (9.7%)1172 (9.2%)10 313 (81.1%)
Quarter of discharge
 110 8391063 (9.8%)977 (9.0%)8799 (81.2%)
 211 815889 (7.5%)859 (7.3%)10 067 (85.2%)
 311 210853 (7.6%)1052 (9.4%)9305 (83.0%)
 411 148906 (8.1%)1049 (9.4%)9193 (82.5%)
Age at FEW
 6–8 mo11 552876 (7.6%)739 (6.4%)9937 (86.0%)
 9–11 mo11 015995 (9.0%)1014 (9.2%)9006 (81.8%)
 ≥12 mo22 4451840 (8.2%)2184 (9.7%)18 421 (82.1%)
No. of primary care visits 1 year after birth
 3–6 visits6617186 (2.8%)286 (4.3%)6145 (92.9%)
 7–11 visits19 6051355 (6.9%)1463 (7.5%)16 787 (85.6%)
 12+ visits18 7902170 (11.5%)2188 (11.6%)14 432 (76.8%)
PCP
 FP: low volume12 936755 (5.8%)932 (7.2%)11 249 (87.0%)
 FP: high volume13 862894 (6.4%)1097 (7.9%)11 871 (85.6%)
 Pediatrician18 2142062 (11.3%)1908 (10.5%)14 244 (78.2%)
Continuity of care
 Very low (<50%)5422384 (7.1%)463 (8.5%)4575 (84.4%)
 Low (50%–67%)7921555 (7.0%)683 (8.6%)6683 (84.4%)
 Medium (67%–86%)11 6681015 (8.7%)1116 (9.6%)9537 (81.7%)
 High (86%–100%)20 0011757 (8.8%)1675 (8.4%)16 569 (82.8%)
Neighborhood income quintile
 Quintile 1 (lowest)10 892755 (6.9%)983 (9.0%)9154 (84.0%)
 Quintile 29367679 (7.2%)816 (8.7%)7872 (84.0%)
 Quintile 39012735 (8.2%)766 (8.5%)7511 (83.3%)
 Quintile 48844808 (9.1%)745 (8.4%)7291 (82.4%)
 Quintile 5 (highest)6897734 (10.6%)627 (9.1%)5536 (80.3%)
Rural residence
 No41 3003457 (8.4%)3691 (8.9%)34 152 (82.7%)
 Yes3712254 (6.8%)246 (6.6%)3212 (86.5%)
Mother vaccinated for influenza in year after delivery
 No38 6312459 (6.4%)2708 (7.0%)33 464 (86.6%)
 Yes63811252 (19.6%)1229 (19.3%)3900 (61.1%)
Mother aged <20 y at first childbirth
 No40 4653483 (8.6%)3585 (8.9%)33 397 (82.5%)
 Yes4547228 (5.0%)352 (7.7%)3967 (87.2%)
Neuromuscular, metabolic, or congenital chronic condition
 No43 1923482 (8.1%)3663 (8.5%)36 047 (83.5%)
 Yes1820229 (12.6%)274 (15.1%)1317 (72.4%)
Cardiovascular chronic condition
 No43 3003446 (8.0%)3682 (8.5%)36 172 (83.5%)
 Yes1712265 (15.5%)255 (14.9%)1192 (69.6%)
Respiratory chronic condition
 No44 0063609 (8.2%)3819 (8.7%)36 578 (83.1%)
 Yes1006102 (10.1%)118 (11.7%)786 (78.1%)
Other chronic condition
 No42 5513409 (8.0%)3627 (8.5%)35 515 (83.5%)
 Yes2461302 (12.3%)310 (12.6%)1849 (75.1%)