Table 2.
Demographic characteristics of the 1304 Icelandic EuroPrevall birth cohort study participants
| Characteristic | Total | Regular fish oil beginning when 1‐6 mo old | Regular fish oil beginning when 7‐15 mo old | No regular fish oil before 15 mo | P |
|---|---|---|---|---|---|
| Size of group (fraction of total) | 1304 (100.0%) | 599 (45.9%) | 434 (33.3%) | 271 (20.8%) | |
| Girls (fraction of group) | 636 (49%) | 299 (50%) | 201 (46%) | 136 (50%) | .664 |
| No 0‐ to 7‐y‐old siblings at home | 724 (56%) | 343 (57%) | 230 (53%) | 151 (56%) | .602 |
| High parent education | 718 (55%) | 333 (56%) | 238 (55%) | 147 (54%) | .985 |
| Animals at home | 290 (22%) | 154 (26%) | 75 (17%) | 61 (23%) | .016 |
| Regular fish oil during pregnancy | 710 (54%) | 368 (61%) | 219 (50%) | 123 (45%) | <.001 |
| Regular vit. D supplem. starting before 3 mo | 787 (60%) | 372 (62%) | 262 (60%) | 153 (56%) | .478 |
| Infant formula with cow milk during 1st week | 387 (30%) | 199 (33%) | 117 (27%) | 71 (26%) | .082 |
| Daily smoking during pregnancy | 104 (8%) | 48 (8%) | 34 (8%) | 22 (8%) | .999 |
| Family allergy severity index | 2.1 ± 2.0 | 2.1 ± 1.9 | 2.1 ± 2.2 | 2.2 ± 1.8 | .666 |
| Mother's age in years | 30.1 ± 4.8 | 30.0 ± 4.8 | 30.1 ± 4.8 | 30.2 ± 4.8 | .843 |
The last two lines show mean ± standard deviation.