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Analysis of general data of the selected children average age.
| Group | Number of children (cases) | Average age(χ ± s, month) | Gender (cases) | Preterm infants [cases (%)] | Age ≤ 12 months [cases (%)] | ||
|---|---|---|---|---|---|---|---|
| Male | Female | ||||||
| Control group | 30 | 37.73 ± 9.86 | 16 | 14 | 2 (6.67) | 7 (23.33) | |
| Severe group | 47 | 38.29 ± 9.49 | 32 | 15 | 7 (14.89) | 18 (38.30) | |
| Nonsevere group | 168 | 39.81 ± 9.05 | 94 | 74 | 17 (10.12) | 48 (28.57) | |
| F/χ 2 | — | 0.592 | 2.519 | 1.444 | 2.344 | ||
| P value | — | 0.554 | 0.284 | 0.486 | 0.310 | ||
