Comparison of the best 3 age-based models.

The Age df, Lat df, and Lon df columns specify the number of degrees of freedom (df) in the cubic spline used to define the relationship of the parameters length, latitude, and longitude with maturity. Where no df are given, the parameter was not included in the model. The Ssn column specifies the number of levels included in the model for season, either 4 (Jan–Mar, Apr–Jun, Jul–Sep, Oct–Dec) or 2 (Oct–Mar, Apr–Sep). A “Y” in the column for Lat*Ssn indicates that an interaction term between latitude and season was included.