Table 1.
Characteristics of the Population for Autistic Disorder Cases and Non-cases in 5 km Distance to Four Governmental Air Monitoring Stations, Los Angeles County, Birth Years 1995–2006.
| Cases (n = 768) No. (%) |
Non-Cases (n = 147,954) No. (%) |
|
|---|---|---|
| Mother’s race/ethnicity | ||
| Non-Hispanic White | 123 (16) | 17,508 (12) |
| Hispanic White | 499 (65) | 103,588 (70) |
| African American/Black | 48 (6) | 9,875 (7) |
| Asian | 93 (12) | 16,163 (11) |
| Other/not specified | 4 (0.5) | 615 (0.4) |
| Missing | 1 (0.1) | 205 (0.1) |
| Mother’s age (years) | ||
| ≤ 18 | 35 (5) | 11,737 (8) |
| 19–25 | 186 (24) | 52,138 (35) |
| 26–30 | 226 (29) | 38,907 (26) |
| 31–35 | 185 (24) | 28,948 (20) |
| > 35 | 136 (18) | 16,224 (11) |
| Source of payment for prenatal care | ||
| Public (Medi-Cal) | 391 (51) | 92,196 (62) |
| Private | 355 (46) | 51,721 (35) |
| Other | 18 (2) | 3,540 (2) |
| Missing | 4 (0.5) | 497 (0.3) |
| Parity | ||
| Primapara | 300 (39) | 54,302 (37) |
| Second | 267 (35) | 44,723 (30) |
| Third | 116 (15) | 27,159 (18) |
| More | 85 (11) | 21,722 (15) |
| Missing | 0 (0) | 48 (0) |
| Maternal education | ||
| Less than high school | 251 (33) | 68,337 (46) |
| High school | 199 (26) | 37,720 (25) |
| More than high school | 315 (41) | 40,636 (27) |
| Missing | 3 (0.4) | 1,261 (0.9) |
| Born in the US | ||
| Yes | 308 (40) | 53,605 (36) |
| No | 460 (60) | 94,059 (64) |
| Missing | 0 (0.0) | 290 (0.2) |
| Child sex | ||
| Male | 624 (81) | 75,401 (51) |
| Female | 144 (19) | 72,552 (49) |
| Missing | 0 (0) | 1 (0) |
Percents may not add to 100% due to rounding.