Table 1 Infant and Maternal Characteristics of JIA Cases and non-JIA Controls born in Washington State 1997–2010
Characteristics | Cases (N = 1,252)a | Controls (N = 6,072)a | ||
|---|---|---|---|---|
n | % | n | % | |
Infant Factors | ||||
Female | 843 | 67.3 | 2,903 | 47.8 |
Twin/multiple gestationb | 18 | 1.4 | 79 | 1.3 |
Race/Ethnicity | ||||
White | 984 | 81.3 | 4,425 | 74.8 |
Black | 37 | 3.1 | 316 | 5.3 |
Asian/Pacific Islander | 60 | 4.9 | 426 | 7.2 |
Native American | 38 | 3.1 | 150 | 2.5 |
Hispanic | 91 | 7.5 | 598 | 10.1 |
Other | 1 | 0.1 | 3 | 0.1 |
Maternal Factors | ||||
Age (years) | ||||
< 20 | 106 | 8.5 | 694 | 11.4 |
20–24 | 233 | 18.6 | 1,536 | 25.3 |
25–29 | 385 | 30.8 | 1,774 | 29.2 |
30–34 | 341 | 27.2 | 1,326 | 21.9 |
35+ | 187 | 14.9 | 739 | 12.2 |
Education (years) | ||||
< 12 | 100 | 12.9 | 639 | 18.0 |
12 | 227 | 29.3 | 1,092 | 30.8 |
12–16 | 188 | 24.2 | 927 | 26.1 |
16+ | 261 | 33.6 | 888 | 25.0 |
Unmarried | 250 | 20.0 | 1,577 | 26.1 |
Trimester of inception of prenatal care | ||||
First | 987 | 85.9 | 4,591 | 81.1 |
Second | 133 | 11.6 | 897 | 15.8 |
Third | 29 | 2.5 | 175 | 3.1 |
Medicaid insurance | 282 | 26.3 | 1,789 | 37.0 |