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Table 4 Linear regression results of age at menarche by the geographic latitude.

From: Association between adolescent idiopathic scoliosis prevalence and age at menarche in different geographic latitudes

Number of obs= 68763 R-squared= 0.342  
F ( 2,288036)= 17855.41 Adj R-squared= 0.342  
(Prob > F ) <0.001 Root MSE= 0.409  
Age at menarche Unstandardized coefficient (B) P > t 95% Conf. Interval
Latitude -0.1123787 <0.001 -0.1135448 -0.1112126
Latitude^2 0.0018579 <0.001 0.0018381 0.0018776
Constant (Intercept) 14.07617 <0.001 14.06203 14.09031