Variables | Types | Codes, values |
---|---|---|
Overall birth defects or specific defects | Dependent variable | 0 = “No” (Reference) 1 = “Yes” |
Sex | Independent variable | 1 = “Females” (Reference) 2 = “Males” 3 = “Unknown” |
Residence | Independent variable | 1 = “Urban” (Reference) 2 = “Rural” |
Number of births | Independent variable | 1 = “Singleton” (Reference) 2 = “Multiple births” |
Paternal age | Independent variable | 1 = “25–29 years old” (Reference) 2 = “<20 years old” 3 = “20–24 years old” 4 = “30–34 years old” 5 = “>=35 years old” |
Maternal age | Independent variable | 1 = “25–29 years old” (Reference) 2 = “<20 years old” 3 = “20–24 years old” 4 = “30–34 years old” 5 = “>=35 years old” |
Number of pregnancies | Independent variable | 1 = “1 time” (Reference) 2 = “2 times” 3 = “3 times” 4 = “>=4 times” |
Parity | Independent variable | 1 = “1 time” (Reference) 2 = “2 times” 3 = “>=3 times” |
Maternal household registration | Independent variable | 1 = “Local” (Reference) 3 = “Non-local” |