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Figure 8. Data point cloud and best fit line according to Griefahn et al. (1976), and regression line derived from evaluation of sub-studies, subdivided into adults, children and old persons. The studies of Steinicke (1957) and Gädeke (1969) are disregarded for both regression and best fit lines. (References: see (Griefahn et al. 1976)).

Figure 8. Data point cloud and best fit line according to Griefahn et al. (1976), and regression line
derived from evaluation of sub-studies, subdivided into adults, children and old persons. The studies of
Steinicke (1957) and Gädeke (1969) are disregarded for both regression and best fit lines. (References:
see (Griefahn et al. 1976)).