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Maximum diving depth in different experience groups; (median test, P = 0.002; Kruskal-Wallis test, P < 0.0001); 13 divers were defined as 'inexperienced' (< 50 dives) (IE), five divers as 'intermediate' (50-200 dives) (IM) and five divers as 'professional' (≥ 500 dives) (PF)
