Level of urbanization is positive in all models in which it appears. Urbanization-squared is negative in all models in which it appears. Economic growth rate is positive in all models in which it appears. Population growth rate is positive in all models in which it appears. Sectoral inequality is negative in all models in which it appears.
Primary exports is negative in all models in which it appears.
Change in tertiary education is negative in all models in which it appears. The discussion in the text is correct. I hope this clears up the confusion. Please let me know if I can help in any other way.