TABLE II.
FINAL LOGISTIC REGRESSION MODELS DESCRIBING THE EFFECTS OF BIRTH ORDER (A) AND SIBSHIP SIZE (B) ON GLIOMA STATUS
| Logistic regression | ||
|---|---|---|
| OR (95% CI) |
||
| Panel A | Panel B | |
| Birth Order | 0.87 (0.79–0.97) | |
| Sibship Size (No. of siblings) | 0.97 (0.91–1.04) | |
| Sex | ||
| Female | 1.00 (reference) | 1.00 (reference) |
| Male | 1.35 (1.04–1.75) | 1.35 (1.04–1.75) |
| Family History of Cancer | ||
| No | 1.00 (reference) | 1.00 (reference) |
| Yes | 1.04 (0.79–1.36) | 1.01 (0.77–1.32) |
| Highest Level of Education | ||
| Some College or Beyond | 1.00 (reference) | 1.00 (reference) |
| High School or Less | 2.11 (1.48–3.00) | 2.02 (1.42–2.87) |
| Age in years | 0.94 (0.90–0.98) | 0.94 (0.90–0.98) |
| Birth cohort | ||
| 1920–19401 | 1.00 (reference) | 1.00 (reference) |
| 1941–1950 | 0.49 (0.28–0.87) | 0.48 (0.27–0.85) |
| 1951–1960 | 0.28 (0.11–0.70) | 0.26 (0.10–0.64) |
| 1961–1970 | 0.18 (0.05–0.65) | 0.16 (0.04–0.59) |
| 1971–1980 | 0.08 (0.01–0.43) | 0.07 (0.01–0.39) |
| Post-1980 | 0.08 (0.01–0.70) | 0.07 (0.01–0.64) |
1
These two decades are grouped together because of the small number of participants born between 1920 and 1930.