Table 7 Goodness of fit R 2 of the possible models that can be used to draw

Table 7 goodness of fit r 2 of the possible models

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Table 7. Goodness of fit (R 2 ) of the possible models that can be used to draw growth curves Group Model R 2 value Dominant Nondominant Combined Boys Thumb palmar abduction Simple 0.59 0.50 0.54 Complex 0.65 0.58 0.60 Thumb opposition Simple 0.63 0.65 0.63 Complex 0.65 0.72 0.67 Thumb (metacarpal phalangeal joint) flexion Simple 0.65 0.74 0.69 Complex 0.68 0.78 0.72 Index finger abduction Simple 0.59 0.60 0.59 Complex 0.61 0.68 0.63 Little finger abduction Simple 0.68 0.65 0.66 Complex 0.71 0.67 0.69 Girls Thumb palmar abduction Simple 0.64 0.66 0.63 Complex 0.65 0.73 0.66 Thumb opposition Simple 0.60 0.55 0.58 Complex 0.66 0.60 0.63 Thumb (metacarpal phalangeal joint) flexion Simple 0.56 0.56 0.56 Complex 0.64 0.65 0.64 Index finger abduction Simple 0.58 0.65 0.61 Complex 0.61 0.71 0.65 Little finger abduction Simple 0.48 0.53 0.50 Complex 0.55 0.61 0.57 Boys and girls combined Thumb palmar abduction Simple 0.61 0.57 0.57 Complex 0.63 0.63 0.62 Thumb opposition Simple 0.59 0.57 0.58 Complex 0.62 0.61 0.61 Thumb (metacarpal phalangeal joint) flexion Simple 0.59 0.62 0.60 Complex 0.61 0.66 0.63 Index finger abduction Simple 0.57 0.62 0.59 Complex 0.59 0.66 0.62 Little finger abduction Simple 0.58 0.59 0.58 Complex 0.61 0.62 0.61 Values are for dominant and nondominant hands separately and for both hands combined; complex models include age, length, and weight as variables; simple models include only age as the dependent variable. Volume 469, Number 3, March 2011 Growth Diagrams for Finger Strength in Children 873 123
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children in the near vicinity of our research facility and they might not be representative of the children who might benefit from using such growth diagrams at followup. Normative values for individual finger strength or thumb strength in children have not been published previously. The normative values presented in this study can be used together with already known reference values for adults [ 8 ]. We found no strength difference between boys and girls and only the measurement of thumb palmar abduction showed a difference between the dominant and nondominant hands. Similarity in strength between both hands is a topic of debate in the liter- ature, with conflicting results being presented [ 3 , 13 ]. By allowing a child’s finger and thumb strength to be plotted with time, the diagrams show how grip strength of a child develops relative to the reference data contained in the diagram. If a child’s strength is plotted at a certain distance from a percentile line, a change in this distance at followup may indicate an increase or decrease in strength relative to his or her age. An additional advantage for individual patient measurements is that a table containing reference data would be difficult to use as such values are given per year or 2-year interval. In contrast, the growth diagrams present a continuum in finger and thumb strength values, allowing individual strength measurement to be compared with an age that corresponds more exactly. When compar- ing our diagrams on thumb strength and finger strength with similar growth diagrams or grip strength in children and diagrams used at children’s welfare centers, we found they show a similar form and shape [ 5 , 6 , 12 ].
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  • Spring '17
  • H. M. Molenaar PhD

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