Calculate the odds that cases (with ASPERGER syndrome) were very low or moderately low birth weight (< 1500 gor 1500-2499 g) relative to the odds that controls (without Asperger syndrome) were very low or moderately low birth weight. Asperger No Asperger ODDS RATIO <1500g 15 61 1500-2499 g 45 146
2500-3999 g 1348 5316