Table 1.
Demographics and provider characteristics among study-eligible children born 2015–2017 in Montana
| Total analytic cohort n=26,085 | Children who completed the combined 7-vaccine series by age 24 months n= 16,503 | Children who did not complete the combined 7-vaccine series by age 24 months n= 9,582 | |
|---|---|---|---|
| Characteristics | n (%) | ||
| Year of Birth | |||
| 2015 | 9,388 (36.0) | 5,466 (33.1) | 3,922 (40.9) |
| 2016 | 9,090 (34.9) | 5,825 (35.3) | 3,265 (34.1) |
| 2017 | 7,607 (29.2) | 5,212 (31.6) | 2,395 (25.0) |
| Sex* | |||
| Female | 12,610 (48.8) | 7,899 (48.3) | 4,711 (49.5) |
| Male | 13,241 (51.2) | 8,444 (51.7) | 4,797 (50.5) |
| Race and ethnicity | |||
| American Indian/Alaska Native, all ethnicities | 1,790 (6.9) | 1,047 (6.3) | 743 (7.8) |
| Other known race/ethnicity* | 1,033 (4.0) | 615 (3.7) | 418 (4.4) |
| Missing race/ethnicity data | 7,676 (29.4) | 4,737 (28.7) | 2,939 (30.7) |
| Non-Hispanic White | 15,586 (59.8) | 10,104 (61.2) | 5,482 (57.2) |
| Categories based on rural-urban commuting area (RUCA) codes | |||
| Rural areas | 3,137 (12.0) | 1,808 (11.0) | 1,329 (13.9) |
| Small towns | 4,618 (17.7) | 2,833 (17.2) | 1,785 (18.6) |
| Micropolitan areas | 7,587 (29.1) | 4,856 (29.4) | 2,731 (28.5) |
| Metropolitan areas | 10,743 (41.2) | 7,006 (42.5) | 3,737 (39.0) |
| Availability of pediatric providers at clinics accessed | |||
| Only accessed clinics with pediatric providers | 5,128 (19.7) | 3,127 (19.0) | 2,001 (20.9) |
| Sometimes accessed clinics with pediatric providers | 13,001 (49.8) | 8,889 (53.9) | 4,112 (42.9) |
| Never accessed clinics with pediatric providers | 7,956 (30.5) | 4,487 (27.2) | 3,469 (36.2) |
| Health Region | |||
| 1 | 1,781 (6.8) | 1,003 (6.1) | 778 (8.1) |
| 2 | 3,724 (14.3) | 2,594 (15.7) | 1,130 (11.8) |
| 3 | 5,984 (22.9) | 4,046 (24.5) | 1,938 (20.2) |
| 4 | 7,325 (28.1) | 4,721 (28.6) | 2,604 (27.2) |
| 5 | 7,271 (27.9) | 4,139 (25.1) | 3,132 (32.7) |
| Tract-level neighborhood deprivation index (NDI), mean (SD) | −0.1 (1.9) | −0.1 (1.9) | 0.0 (1.9) |
| County-level family medicine and pediatric provider density per 1,000 children age 0–5 | |||
| <10 | 1,365 (5.2) | 922 (5.6) | 443 (4.6) |
| 10–14.99 | 15,666 (60.1) | 10,022 (60.7) | 5,644 (58.9) |
| 15–19.99 | 6,227 (23.9) | 3,856 (23.4) | 2,371 (24.7) |
| ≥20 | 2,827 (10.8) | 1,703 (10.3) | 1,124 (11.7) |
| Distance (miles) to nearest immunization provider, median (IQR) | 1.7 (3.2) | 1.7 (3.2) | 1.6 (3.2) |
| Distance (miles) to nearest immunization provider | |||
| Short (≤2 miles) | 14,577 (55.9) | 9,147 (55.4) | 5,430 (56.7) |
| Medium (2.01–10 miles) | 9,453 (36.2) | 6,049 (36.7) | 3,404 (35.5) |
| Long (>10 miles) | 2,055 (7.9) | 1,307 (7.9) | 748 (7.8) |