| | (%) | (%) of missing data* |
| | Questionnaire filled out by | | 1,030 (6.9) | | Both father and mother | 3,022 (21.8) | | | Mother only | 8,619 (62.3) | | | Father only | 1,738 (12.6) | | | Grandparents | 216 (1.6) | | | Others | 237 (1.7) | | | Age | | 1,700 (11.4) | | Less than 3 years old | 489 (3.7) | | | 3 years old | 1,631 (12.4) | | | 4 years old | 3,740 (28.4) | | | 5 years old | 5,021 (38.1) | | | years old | 2,281 (17.4) | | | Gender | | 2,278 (15.3) | | Female | 6,101 (48.5) | | | Male | 6,483 (51.5) | | | Gestational age | | 521 (3.5) | | Before week 32 | 205 (1.4) | | | In week 32–36 | 2,178 (15.2) | | | In week 37–42 | 10,731 (74.8) | | | In week 43 or later | 745 (5.2) | | | Unknown | 482 (3.4) | | | Birth weight | | 230 (1.5) | | Less than 2500 grams | 932 (6.4) | | | 2500–4200 grams | 13,376 (91.4) | | | More than 4200 grams | 180 (1.2) | | | Unknown | 144 (1) | | | Breastfed totally or partly until | | 279 (1.9) | | Never | 5,630 (38.6) | | | Younger than 3 months | 6,087 (41.7) | | | 3–6 months | 1,371 (9.4) | | | Older than 6 months | 1,495 (10.3) | | | The age first given infant formula | | 969 (6.5) | | Never | 248 (1.8) | | | Younger than 3 months | 9,739 (70.1) | | | 3–6 months | 2,568 (18.5) | | | Older than 6 months | 1,338 (9.6) | | | The age first introducing complementary foods | | 590 (4) | | Never | 111 (0.8) | | | Younger than 3 months | 220 (1.5) | | | 3–6 months | 5,761 (40.4) | | | Older than 6 months | 8,180 (57.3) | | | Ever had allergic symptoms to foods | | 449 (3) | | Unknown | 1,022 (7.1) | | | Never | 11,947 (82.9) | | | Yes, ever had allergic reaction to | 1,444 (10.0) | | | seafood | 768 (53.1) | | | milk or dairy products | 269 (18.4) | | | eggs | 233 (16.1) | | | peanuts | 136 (9.4) | | | fish | 124 (8.6) | | | fruit | 101 (7.0) | | | soya, peas, beans | 48 (3.3) | | | vegetables | 44 (3.1) | | | nuts, almond | 43 (3) | | | flour | 34 (2.4) | | | others | 376 (26.1) | | | Family history | | 424 (2.9) | | Paternal asthma | 310 (2.1) | | | Paternal allergic rhinitis or eczema | 2,709 (18.8) | | | Maternal asthma | 408 (2.8) | | | Maternal allergic rhinitis or eczema | 2,733 (18.9) | | | Sibling with asthma | 643 (4.4) | | | Sibling with allergic rhinitis or eczema | 2,361 (16.4) | | | Paternal educational levels | | 336 (2.3) | | Junior and junior high school | 2,348 (16.1) | | | Senior high school | 5,943 (40.9) | | | Undergraduate degree | 5,216 (35.9) | | | Graduate degree | 1,019 (7) | | | Maternal educational levels | | 369 (2.5) | | Lower than junior high school | 2,117 (14.6) | | | Senior high school | 6,510 (44.9) | | | Undergraduate degree | 5,476 (37.8) | | | Graduate degree | 390 (2.7) | | | Parents smoked during the child’s first year of life | | 627 (4.9) | | Either father or mother smoked | 6,303 (49.7) | | | Indoor problems with water damage | | 215 (1.7) | | In any room of the home | 3,205 (35.7) | |
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