Function Estimate Std-Error Function Estimate Std-Error f1(age) -0.2390 0.1379 g1(age) -0.7419 0.8342 f2(age) -1.3712 0.1258 g2(age) -0.2761 0.0592 f3(age) -3.5872 0.1492 g3(age) 0.0042 0.0010 f4(age) -4.4930 0.1782 g4(age) -0.0400 0.0825 f5(age) -5.5646 0.2091 g5(age) 0.0465 0.0239 f6(age) -4.9913 0.2489 g6(age) 0.0034 0.0036

Table 4: Estimates of fixed effects and their standard errors for different splines for the girls only data.