The worldwide incidence of preterm birth: a systematic review of maternal mortality and morbidity
Stacy Beck, Daniel Wojdyla, Lale Say, Ana Pilar Betran, Mario Merialdi, Jennifer Harris Requejo, Craig Rubens, Ramkumar Menon & Paul FA Van Look
Volume 88, Number 1, January 2010, 31-38
Table 1. Variables included in the regression model, number of countries modelled, and predictive power of the model, by region, in a systematic review of the worldwide incidence of preterm birth
| Region/groupinga | Predictor variableb | No. of countries modelled/total | Adjusted R² | |
|---|---|---|---|---|
| Africa | Proportion of urban population | 30/52 | 0.644 | |
| Total expenditure on health | ||||
| Life expectancy at birth (male) | ||||
| Under-five mortality | ||||
| Asia | Government expenditure on health | 25/47 | 0.424 | |
| Low birth weight | ||||
| Under-five mortality | ||||
| Human development index | ||||
| Europe, North Americac and Australia and New Zealand | Immunization coverage for DPT3 | 9/43 | 0.421 | |
| Total expenditure on health | ||||
| Government expenditure on health | ||||
| Healthy life expectancy at birth (adult, female) | ||||
| Latin America and the Caribbean and Oceania (excluding Australia and New Zealand) | Immunization coverage for measles | 23/37 | 0.603 | |
| Per capita total expenditure on health | ||||
| Mortality rate (females) | ||||
| Low birth weight |
DPT3, diphtheria, pertussis and tetanus, third and final dose.
a For application of models, country groupings were defined based on sociodemographic similarities.
b See Appendix A (http://www.who.int/reproductivehealth/publications/monitoring/en/index.html) for definitions and sources of variables.
c In this analysis, Mexico was included in Latin America rather than North America.