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Variable Assignment
| Variables | Grouping | Assignment |
|---|---|---|
| Gestational age | <28w | 1 |
| 28–31+6w | 2 | |
| 32–33+6w | 3 | |
| 34–36+6w | 4 | |
| Mother’s COVID-19 vaccination history | With | 1 |
| Without | 2 | |
| Referral history | With | 1 |
| Without | 2 | |
| Disease history | With | 1 |
| Without | 2 | |
| History of allergy/bloody stool | With | 1 |
| Without | 2 | |
| Guardian education level | Elementary school and below | 1 |
| Junior high school and technical secondary school | 2 | |
| High school and junior college | 3 | |
| Bachelor’s degree or above | 4 | |
| Age | Original value input |
