1. Past consumer 0.95 0.55-1.66 1.07 0.69-1.68 1.09 0.64-1.85
2. Low (< 1 mg) 1.26 0.57-2.81 0.90 0.45-1.80 1.40 0.65-2.99
3. Moderate (1.01-7 mg) 0.53 0.18-1.51 1.06 0.52-2.16 0.69 0.33-1.42
4. High (>7 mg) 0.51 0.18-1.48 0.36 0.14-0.92 0.71 0.35-1.41
5. Number of years Each year 0.98 0.94-1.02 0.98 0.96-1.02 0.97 0.94-0.99