highly significantp < 0.0001
The spline for child age was highly significant ( χ 2 = 459.23, df = 8, p < 0.0001) and showed a more complex functional form (EDF = 6.95).
The spline for child age was highly significant ( χ 2 = 459.23, df = 8, p < 0.0001) and showed a more complex functional form (EDF = 6.95).