Table 1. Demographic characteristics and self-reported exposure information of MS cases and controls (n=713).
| Case (n=217) n (%) |
Control (n=496) n (%) |
|
|---|---|---|
| State of Residence a,b | ||
| Georgia | 68 (31) | 149 (30) |
| Missouri | 18 (8) | 51 (10) |
| Ohio | 75 (35) | 161 (32) |
| Texas | 56 (26) | 135 (27) |
| Sexb | ||
| Male | 43 (20) | 106 (21) |
| Female | 174 (80) | 390 (79) |
| Education Attainedc | ||
| Less than High School Graduate | 8 (4) | 19 (4) |
| High School Graduate | 46 (21) | 84 (17) |
| Some Colleg e/Technical School | 69 (32) | 153 (31) |
| Graduated College | 94 (43) | 240 (48) |
| Lead Exposure d | ||
| Yes | 36 (17) | 54 (11) |
| No | 139 (64) | 368 (74) |
| Don't know | 42 (19) | 74 (15) |
| Mercury Exposure d | ||
| Yes | 25 (12) | 36 (7) |
| No | 161 (74) | 417 (84) |
| Don't know | 31 (14) | 43 (9) |
| Organic Solvents Exposured | ||
| Yes | 10 (5) | 30 (6) |
| No | 188 (86) | 446 (90) |
| Don't know | 19 (9) | 20 (4) |
| No. of Exposures | ||
| 0 | 119 (55) | 323 (65) |
| 1 | 34 (16) | 55 (11) |
| >1 | 11 (5) | 23 (5) |
| Don't know | 53 (24) | 95 (19) |
a
State lived in between Jan 1998 and Dec 2000 based on self-report.
b
Matching factor. Age at interview and race/ethnicity were also matching factors (not shown).
c
Highest level of education completed based on self-report.
d
Self-reported exposure. Among MS cases, exposure was at least 1 year prior to MS symptom onset. Among controls, exposure was at least 1 year prior to interview.