Meta-regression analysis potential factors* influencing the heterogeneity of incidence of severe neonatal jaundice
| Variable | Coefficient | 95% CI | p Value |
| Intercept | −6.55 | −8.76 to 4.81 | 0.001 |
| Study design | −0.48 | −1.75 to 0.79 | 0.461 |
| Study duration | −0.15 | −0.32 to 0.03 | 0.100 |
| Gestation | −0.18 | −1.64 to 1.28 | 0.812 |
| Income | 3.59 | 1.79 to 5.38 | 0.001 |
*Study design (prospective vs retrospective); study duration (years); gestation (all vs term and near term); income (low vs high) based on World Bank classifications (https://datahelpdesk.worldbank.org/knowledgebase/articles/906519).