| 
      
        | Function | Estimate | Std-Error | Function | Estimate | Std-Error |  
        | f1(age) | -0.7643 | 0.1275 | f1(age)*girl | 0.5111 | 0.1756 |  
        | f2(age) | -1.2067 | 0.1093 | f2(age)*girlgirl | -0.1676 | 0.1544 |  
        | f3(age) | -3.1533 | 0.1417 | f3 (age)*girl | -0.4388 | 0.2000 |  
        | f4(age) | -4.1287 | 0.1796 | f4 (age)*girl | -0.3573 | 0.2503 |  
        | f5(age) | -4.9552 | 0.2077 | f5 (age)*girl | -0.6107 | 0.2878 |  
        | f6(age) | -4.8680 | 0.2558 | f6 (age)*girl | -0.1322 | 0.3534 |  |