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Table 2 Linear regression results of AIS prevalence by the geographic latitude. The inclusion of the (Latitude)2 term implies a possible quadratic relationship.

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

Number of obs= 287939 R-squared= 0.509  
F ( 2,288036)= 149257.39 Adj R-squared= 0.509  
(Prob > F ) <0.001 Root MSE= 0.7122  
Prevalence Unstandardized coefficient (B) P > t 95% Conf. Interval
Latitude 0.024758 < 0.001 0.024045 0.0254713
Latitude^2 0.000484 <0.001 0.000472 0.0004965
Constant (Intercept) 0.712796 <0.001 0.703129 0.7224631