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Table 2 Estimated parameters of final fit to model percentage of spontaneous preterm birth

From: Association between preterm births and socioeconomic development: analysis of national data

Coefficient

Estimate

Standard error

z-value

Intercept

6.590

1.752

3.761

HDI

 − 8.154

2.326

 − 3.506

Φ

15.37

4.064

3.782

  1. All p < 0.001