Table 1.
The cohort information in the study
| Category | Variable | Statistics no. (%) |
|---|---|---|
| Child | Age, median (range)—years | 1 (11 months–2) |
| Sex (male) | 341 (51.5) | |
| Race (Caucasian) | 632 (95.5) | |
| Gestational age, median (range)—week | 40 (29–42) | |
| Living area: | ||
| Rural | 292 (46.5) | |
| Urban | 336 (53.5) | |
| Birth Season: | ||
| Spring | 177 (26.7) | |
| Summer | 139 (21) | |
| Autumn | 141 (21.3) | |
| Winter | 205 (31) | |
| Delivery mode: | ||
| Vaginal | 520 (78.5) | |
| Cesarean | 142 (21.5) | |
| Siblings | 382 (72.1) | |
| Type of home: | ||
| House | 229 (42.4) | |
| Apartment | 311 (57.6) | |
| Food: | ||
| Breastfeeding + solid food | 98 (14.8) | |
| Solid food | 562 (85.2) | |
| Breastfeeding history | 653 (98.9) | |
| Total days of breastfeeding (mean ± sd) | 250 ± 165 | |
| Fish oil | 327 (49.5) | |
| Antibiotics in the year prior to sampling | 311 (47) | |
| During pregnancy | Pet: | |
| Cat | 133 (20.2) | |
| Dog | 123 (18.8) | |
| Antibiotics | 271 (40.9) | |
| Smoking | 47 (7.1) | |
| Alcohol | 34 (5.1) | |
| Maternal information | Age, median (range)—years | 32 (19–48) |
| Mother BMI—kg/m2 (mean ± sd) | 23.6 ± 4.3 | |
| Income level: | ||
| Low | 63 (9.5) | |
| Medium | 352 (53.3) | |
| High | 246 (37.2) | |
| Education level: | ||
| Low | 53 (8%) | |
| Medium | 423 (63.9%) | |
| High | 186 (28.1%) |
Antibiotic information for infants refers to antibiotic use during 1st year prior to sampling. Antibiotic information for pregnancy refers to antibiotics used during delivery