Table 1.

The Akaike Information Criterion (AIC), Schwarz's Bayesian Criterion (BIC), and effective degrees of freedom (edf) for completely parametric (model 1), semi-parametric (models 2 and 3), and non-parametric (models 4 and 5) models.

Model components	Females					Males
	edf	AIC	Rank	BIC	Rank	edf	AIC	Rank	BIC	Rank
Model 1: a + b	3	22,571.69	5	22,596.00	5	3	12,196.91	5	12,220.32	5
Model 2: f(a) + b	6.99	21,841.76	3	21,897.11	2	8.25	11,968.76	3	12,033.11	1
Model 3: a + f(b)	6.61	21,945.97	4	21,999.54	4	8.03	12,003.26	4	12,065.93	4
Model 4: f(a) + f(b)	9.93	21,779.61	1	21,860.10	1	12.5	11,938.44	1	12,035.99	2
Model 5: f(a, b)	15.7	21,785.40	2	21,912.22	3	15.5	11,939.81	2	12,060.90	3

a, age; b, year of birth; f, smooth function.