|  | Unadjusted odds ratios (95% CI) | Adjusted odds ratios* (95% CI) | ||||
---|---|---|---|---|---|---|---|
 | Outcome | Quartile 1 vs Quartile 2 | Quartile 1 vs Quartile 3 | Quartile 1 vs Quartile 4 | Quartile 1 vs Quartile 2 | Quartile 1 vs Quartile 3 | Quartile 1 vs Quartile 4 |
Nitrate | Â | Â | Â | Â | Â | Â | |
 | Cleft lip only | 1.00 (0.80-1.26) | 0.85 (0.67-1.08) | 0.90 (0.71-1.14) | 1.01 (0.80-1.28) | 0.89 (0.68-1.15) | 1.01 (0.76-1.33) |
 | Cleft lip with cleft plate | 1.05 (0.88-1.25) | 0.93 (0.77-1.11) | 0.89 (0.74-1.07) | 1.07 (0.89-1.28) | 0.96 (0.79-1.16) | 0.90 (0.73-1.13) |
 | Cleft palate only | 1.02 (0.83-1.24) | 0.99 (0.81-1.20) | 0.98 (0.81-1.20) | 1.06 (0.86-1.29) | 1.05 (0.85-1.30) | 1.15 (0.91-1.46) |
 | Cleft lip with or without cleft palate | 1.04 (0.89-1.20) | 0.90 (0.77-1.05) | 0.89 (0.77-1.04) | 1.04 (0.90-1.22) | 0.93 (0.79-1.09) | 0.93 (0.78-1.12) |
Nitrite | Â | Â | Â | Â | Â | Â | |
 | Cleft lip only | 0.82 (0.64-1.04) | 0.94 (0.75-1.19) | 0.92 (0.73-1.17) | 0.85 (0.67-1.08) | 1.03 (0.80-1.33) | 1.11 (0.81-1.51) |
 | Cleft lip with cleft plate | 0.99 (0.82-1.19) | 1.04 (0.86-1.25) | 1.25 (1.04-1.49) | 1.02 (0.85-1.24) | 1.02 (0.84-1.25) | 1.12 (0.88-1.42) |
 | Cleft palate only | 0.82 (0.67-0.99) | 0.87 (0.72-1.06) | 0.83 (0.69-1.01) | 0.85 (0.70-1.04) | 0.97 (0.79-1.20) | 1.02 (0.78-1.32) |
 | Cleft lip with or without cleft palate | 0.92 (0.79-1.08) | 1.00 (0.86-1.16) | 1.12 (0.97-1.30) | 0.95 (0.81-1.11) | 1.02 (0.86-1.20) | 1.10 (0.91-1.35) |
Animal Nitrite | Â | Â | Â | Â | Â | Â | |
 | Cleft lip only | 0.98 (0.77-1.24) | 0.92 (0.72-1.17) | 1.12 (0.89-1.42) | 1.00 (0.78-1.27) | 1.00 (0.78-1.29) | 1.32 (1.01-1.72) |
 | Cleft lip with cleft plate | 1.03 (0.86-1.24) | 1.01 (0.84-1.21) | 1.24 (1.04-1.48) | 1.06 (0.88-1.28) | 1.03 (0.85-1.24) | 1.22 (0.99-1.49) |
 | Cleft palate only | 0.86 (0.71-1.05) | 0.90 (0.74-1.10) | 0.87 (0.72-1.06) | 0.89 (0.73-1.08) | 0.97 (0.79-1.19) | 1.01 (0.80-1.27) |
 | Cleft lip with or without cleft palate | 1.01 (0.87-1.18) | 0.97 (0.84-1.14) | 1.20 (1.04-1.39) | 1.03 (0.88-1.21) | 1.01 (0.86-1.19) | 1.24 (1.05-1.48) |
Plant Nitrite | Â | Â | Â | Â | Â | Â | |
 | Cleft lip only | 1.02 (0.81-1.29) | 1.05 (0.83-1.32) | 0.91 (0.71-1.15) | 1.09 (0.85-1.39) | 1.15 (0.89-1.50) | 1.04 (0.74-1.46) |
 | Cleft lip with cleft plate | 0.98 (0.82-1.17) | 0.92 (0.77-1.11) | 1.16 (0.98-1.39) | 1.03 (0.85-1.24) | 0.95 (0.77-1.16) | 0.98 (0.76-1.27) |
 | Cleft palate only | 0.92 (0.75-1.12) | 1.03 (0.85-1.24) | 0.84 (0.69-1.03) | 0.97 (0.79-1.19) | 1.15 (0.93-1.43) | 1.01 (0.76-1.33) |
 | Cleft lip with or without cleft palate | 1.00 (0.86-1.16) | 0.97 (0.83-1.12) | 1.07 (0.92-1.24) | 1.05 (0.89-1.23) | 1.02 (0.86-1.20) | 1.00 (0.81-1.24) |
Nitrosamine | Â | Â | Â | Â | Â | Â | |
 | Cleft lip only | 0.74 (0.58-0.94) | 0.72 (0.56-0.92) | 1.02 (0.81-1.27) | 0.87 (0.69-1.09) | 0.99 (0.78-1.26) | 0.85 (0.64-1.13) |
 | Cleft lip with cleft plate | 0.89 (0.74-1.06) | 0.89 (0.74-1.06) | 0.93 (0.78-1.11) | 0.90 (0.75-1.08) | 0.95 (0.78-1.15) | 0.89 (0.71-1.10) |
 | Cleft palate only | 0.85 (0.70-1.03) | 0.86 (0.71-1.05) | 0.77 (0.64-0.94) | 0.78 (0.64-0.95) | 0.85 (0.69-1.05) | 0.88 (0.69-1.11) |
 | Cleft lip with or without cleft palate | 0.83 (0.72-0.97) | 0.83 (0.71-0.96) | 0.96 (0.83-1.11) | 0.89 (0.76-1.03) | 0.96 (0.82-1.13) | 0.87 (0.73-1.04) |