| Variables | Categorical variable description | No of categories |
| Region | Tigray, Afar, Amhara, Oromia, Somali, Benishangul-Gumuz, SNNPR, Gambela, Harari, Dire Dawa | 10 | Fathers’ and mothers’ education level | No education, primary, secondary and above | 3 | Twin child status | Single, multiple | 2 | Place of delivery | Home, public sector, private sector | 3 | Mothers’ and fathers’ occupation status | Not working, had working | 2 | Mothers’ current marital status | Others, married | 2 | Age of mothers at first birth | 16, 16 | 2 | Sources of drinking water | Piped, others | 2 | Types of toilet facility | Use toilet, no any kind of toilet | 2 | Breast feeding | No, yes | 2 | Birth order number | First, 2-3, 4 and above | 3 | Religion | Orthodox, Muslim, others | 3 | Contraceptive method | No, yes | 2 | Vaccination of child | No, yes | 2 | Family size | 1–3, 4–6, 7 | 3 | Wealth index | Poor, medium, rich | 3 | Sex of child | Male, female | 2 | Mothers’ age group (years) | Below 20, 20–29, 30–39, 40 and above | 4 | Number of antenatal visits | No visits, 1–3, 4 and above visited | 3 | Preceding birth interval (months) | 0–24, 25–36, 36 | 3 |
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