TABLE 1—
Characteristics of 39 708 Infants in the Oregon Health Plan and Initiation of Immunization by 3 Months of Age: 2000–2001
| Infant Immunization Initiated by 3 Months of Age? | |||
| Infant Characteristic at Time of Birth (n) | No (%) | Yes (%) | Pa |
| Birth Year | .000* | ||
| 2000 (21 011) | 3660 (17.4) | 17 351 (82.6) | |
| 2001 (18 697) | 2816 (15.1) | 15 881 (84.9) | |
| Total (39 708) | 6476 (16.3) | 33 232 (83.7) | |
| Gender | .341 | ||
| Female (19 211) | 3098 (16.1) | 16 113 (83.9) | |
| Male (20 497) | 3378 (16.5) | 17 119 (83.5) | |
| Race/ethnicity | .000* | ||
| Asian (909) | 132 (14.5) | 777 (85.5) | |
| Black (1556) | 305 (19.6) | 1251 (80.4) | |
| Hispanic (11 704) | 1666 (14.2) | 10 038 (85.8) | |
| Native American (646) | 122 (18.9) | 524 (81.1) | |
| White (24 131) | 4085 (16.9) | 20 046 (83.1) | |
| Other (376) | 82 (21.8) | 294 (78.2) | |
| Unknown (351) | 78 (22.2) | 273 (77.8) | |
| Place of birth | .730 | ||
| Urban (21 819) | 3545 (16.2) | 18 274 (83.8) | |
| Suburban (6032) | 1004 (16.6) | 5028 (83.4) | |
| Rural (11 815) | 1916 (16.2) | 9899 (83.8) | |
| Oregon Health Plan program | .000* | ||
| Temporary Assistance for Needy Families (11 286) | 2249 (19.9) | 9037 (80.1) | |
| Foster or subadoptive care (721) | 162 (22.5) | 559 (77.5) | |
| Poverty Level Medical, pregnant women and their newborns/Children’s Health Insurance Program/Oregon Health Plan (27 319) | 3964 (14.5) | 23 355 (85.5) | |
| Blind or disabled (270) | 70 (25.9) | 200 (74.1) | |
| Date Oregon Health Plan coverage began by infant age | .000* | ||
| Date of birth (32 047) | 4519 (14.1) | 27 528 (85.9) | |
| 1 wk–1 mo (874) | 129 (14.8) | 745 (85.2) | |
| 1–2 mo (780) | 174 (22.3) | 606 (77.7) | |
| after 2 mo (6007) | 1772 (29.5) | 4235 (70.5) | |
| Mother’s Oregon Health Plan status at birth of infant | |||
| Mother in Oregon Health Plan on infant date of birth (34 743) | 5416 (15.6) | 29 327 (84.4) | .000* |
| Mother not in Oregon Health Plan on infant date of birth (4965) | 1060 (21.3) | 3905 (78.7) | |
| Mother’s age, y, at time of birth of infant | .005* | ||
| 11–17 (1507) | 220 (14.6) | 1287 (85.4) | |
| 18–20 (7509) | 1104 (14.7) | 6405 (85.3) | |
| 21–25 (12 222) | 1881 (15.4) | 10 341 (84.6) | |
| 26–35 (10 325) | 1605 (15.5) | 8720 (84.5) | |
| ≥ 36 (2154) | 388 (18.0) | 1766 (82.0) | |
| Mother’s language | .000* | ||
| English (25 621) | 4086 (15.9) | 21 535 (84.1) | |
| Spanish (7120) | 904 (12.7) | 6216 (87.3) | |
| Russian (475) | 135 (28.4) | 340 (71.6) | |
| Vietnamese (130) | 8 (6.2) | 122 (93.8) | |
| Other or unknown (1424) | 294 (20.6) | 1130 (79.4) | |
| Mother’s number of Oregon Health Plan births in 2000–2001 | .000* | ||
| 1 (31 790) | 4876 (15.3) | 26 914 (84.7) | |
| 2 (2876) | 532 (18.5) | 2344 (81.5) | |
| 3 (96) | 17 (17.7) | 79 (82.3) | |
| 4 (8) | 2 (25) | 6 (75) | |
aP value for association with immunization initiation calculated with the χ2 test for categorical variables, the t test for continuous variables, and the Spearman correlation coefficient for ordinal variables.
**Denotes P ≥ .10; inclusion into regression model.