| | Covariates | aOR (95% CI) |
| | Sex of child (ref: male) | — | | Female | 0.96 (0.94, 0.98) | | Type of birth (ref: single) | | | 1st of multiple | 1.03 (0.07, 1.107) | | 2nd of multiple | 1.07 (1.00, 1.16) | | Education (ref: no formal education) | — | | Primary | 0.97 (0.94, 1.01) | | Secondary | 0.94 (0.91, 0.97) | | Tertiary | 0.86 (0.82, 0.90) | | Source of drinking water (ref: improved) | — | | Unimproved | 1.00 (0.98, 1.02) | | Religion (ref: catholic) | — | | Christian | 1.02 (0.98, 1.06) | | Islamic | 1.08 (1.04, 1.13) | | Traditionalist | 0.89 (0.77, 1.03) | | No religion | 1.07 (0.93, 1.23) | | Wealth index (ref: poorest) | — | | Poorer | 0.97 (0.94, 1.01) | | Middle | 0.91 (0.94, 1.01) | | Richer | 0.89 (0.86, 0.93) | | Richest | 0.83 (0.79, 0.87) | | Currently breastfeeding (ref: no) | — | | Yes | 1.01 (0.98, 1.03) | | Total children born | 1.00 (0.98, 1.03) | | Size of child at birth (ref: very large) | — | | Larger than average | 0.99 (0.95, 1.02) | | Average | 0.97 (0.94, 1.01) | | Smaller than average | 1.00 (0.96, 1.04) | | Very small | 0.98 (0.92, 1.05) | | Don’t know | 0.97 (0.89, 1.05) | | Child age in month (ref: 6–23) | — | | 24–41 | 0.89 (0.87, 0.91) | | 42–59 | 0.83 (0.81, 0.85) | | Ethnicity (ref: ekoi) | — | | Fulani | 0.99 (0.93, 1.05) | | Hausa | 0.99 (0.93, 1.06) | | Igbo | 0.94 (0.91, 1.03) | | Yoruba | 0.99 (0.94, 1.05) | | Place of residence (ref: urban) | — | | Rural | 1.04 (1.01, 1.07) | | Region (ref: north central) | — | | North-east | 0.93 (0.90, 0.98) | | North-west | 0.96 (0.92, 1.00) | | South-east | 1.14 (1.07, 1.22) | | South-south | 1.13 (1.08, 1.19) | | South-west | 1.04 (0.98, 1.09) |
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