Table 1.
Socio-demographic characteristics of the study groups; Poland, 2018.
| Variable | Cases N = 50 |
Controls N = 104 |
p |
|---|---|---|---|
| n (%) | n (%) | ||
| Maternal age | 0.85 | ||
| 20–30 years | 21 (42.0%) | 42 (40.4%) | |
| 31–40 years | 29 (58.0%) | 62 (59.6%) | |
| Infant residence | <0.001 * | ||
| City ≤ 400,000 inhabitants | 15 (30.0%) | 1 (1.0%) | |
| City >400,000 inhabitants | 35 (70.0%) | 103 (99.0%) | |
| Socio-economic status of family | 0.99 | ||
| High | 11 (22.0%) | 22 (21.2%) | |
| Medium/low | 39 (78.0%) | 80 (78.8%) | |
| Maternal educational status | 0.22 | ||
| Below high | 5 (10.0%) | 20 (19.2%) | |
| High | 45 (90.0%) | 84 (80.8%) | |
| Number of children in family | 0.12 | ||
| 1 | 24 (48.0%) | 33 (31,7%) | |
| >1 | 26 (52.0%) | 71 (68.3%) |
* p ≤ 0.05.