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Figure 3. Data point cloud based on sub-studies according to Griefahn et al. ((1976), attachment 4), subdivided into adults, children, and old persons. Not included: Steinicke (1957) and Gädeke (1969). (Reference: see (Griefahn et al. 1976)).

Figure 3. Data point cloud based on sub-studies according to Griefahn et al. ((1976), attachment 4),
subdivided into adults, children, and old persons. Not included: Steinicke (1957) and Gädeke (1969).
(Reference: see (Griefahn et al. 1976)).