Frequency of maternal intake of different seafood and ORs for the risk of an SGA infant
| Intake frequency | SGA group n (%) | Controls n (%) | cOR (95% CI) | aOR* (95% CI) |
| Lean fish (100–150 g) | ||||
| Never | 47 (9.1) | 32 (6.2) | 1 (ref.) | 1 (ref.) |
| 1–3 a month | 108 (20.9) | 105 (20.3) | 0.68 (0.40 to 1.15) | 0.70 (0.39 to 1.26) |
| 1 a week | 301 (58.1) | 291 (56.2) | 0.67 (0.41 to 1.09) | 0.70 (0.41 to 1.20) |
| >1 a week | 62 (12.0) | 90 (17.4) | 0.45 (0.25 to 0.80) | 0.53 (0.28 to 1.01) |
| Fatty fish (130 g) | ||||
| Never | 77 (14.9) | 73 (14.1) | 1 (ref.) | 1 (ref.) |
| 1–3 a month | 130 (25.1) | 113 (21.8) | 1.09 (0.72 to 1.68) | 1.22 (0.76 to 1.96) |
| 1 a week | 258 (49.8) | 263 (50.8) | 0.93 (0.64 to 1.36) | 0.96 (0.62 to 1.47) |
| >1 a week | 53 (10.2) | 69 (13.3) | 0.73 (0.45 to 1.19) | 0.69 (0.40 to 1.20) |
| Salted-smoked fish (60 g) | ||||
| Never | 312 (60.2) | 321 (62.0) | 1 (ref.) | 1 (ref.) |
| 1–3 a month | 149 (28.8) | 125 (24.1) | 1.21 (0.92 to 1.62) | 1.28 (0.93 to 1.75) |
| 1+ a week | 57 (11.0) | 72 (13.9) | 0.82 (0.56 to 1.21) | 0.73 (0.48 to 1.11) |
| Shellfish-bivalves molluscs (6 units; 100–150 g) | ||||
| Never | 183 (35.3) | 162 (31.3) | 1 (ref.) | 1 (ref.) |
| 1–3 a month | 228 (44.0) | 228 (44.0) | 0.88 (0.66 to 1.17) | 0.90 (0.66 to 1.22) |
| 1 a week | 102 (19.7) | 113 (21.8) | 0.77 (0.55 to 1.09) | 0.73 (0.50 to 1.06) |
| >1 a week | 5 (1.0) | 15 (2.9) | 0.28 (0.10 to 0.80) | 0.25 (0.08 to 0.76) |
| Shellfish-cephalopods (200 g) | ||||
| Never | 149 (28.8) | 116 (22.4) | 1 (ref.) | 1 (ref.) |
| 1–3 a month | 237 (45.8) | 282 (54.4) | 0.61 (0.45 to 0.84) | 0.62 (0.44 to 0.87) |
| 1+ a week | 132 (25.5) | 120 (23.2) | 0.85 (0.60 to 1.20) | 0.93 (0.64 to 1.37) |
| Shellfish-crustacean (4–5 units; 200 g) | ||||
| Never | 164 (31.7) | 144 (27.8) | 1 (ref.) | 1 (ref.) |
| 1–3 a month | 256 (49.4) | 279 (53.9) | 0.80 (0.61 to 1.07) | 0.85 (0.62 to 1.16) |
| 1+ a week | 98 (18.9) | 95 (19.3) | 0.90 (0.62 to 1.29) | 0.92 (0.62 to 1.37) |
| Canned fish-raw (small can; 50 g) | ||||
| Never | 175 (33.8) | 147 (28.4) | 1 (ref.) | 1 (ref.) |
| 1–3 a month | 149 (28,8) | 152 (29.3) | 0.82 (0.60 to 1.14) | 0.87 (0.62 to 1.24) |
| 1 a week | 160 (30.9) | 171 (33.0) | 0.78 (0.58 to 1.07) | 0.81 (0.58 to 1.12) |
| >1 a week | 34 (6.6) | 48 (9.3) | 0.57 (0.34 to 0.96) | 0.64 (0.37 to 1.13) |
| Canned fish with oil (small can; 50 g) | ||||
| Never | 161 (31.1) | 150 (29.0) | 1 (ref.) | 1 (ref.) |
| 1–3 a month | 143 (27.6) | 170 (32.8) | 0.78 (0.57 to 1.08) | 0.82 (0.58 to 1.16) |
| 1 a week | 176 (34.0) | 158 (30.5) | 1.04 (0.76 to 1.42) | 0.99 (0.71 to 1.38) |
| >1 a week | 38 (7.3) | 40 (7.7) | 0.89 (0.54 to 1.46) | 1.00 (0.58 to 1.73) |
*Adjusted for energy intake, educational level, smoking, pregestational BMI and previous preterm or low birthweight newborn.
aOR, adjusted OR; BMI, body mass index; cOR, crude OR; SGA, small for gestational age.