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Table 12 Age, number of species and number of uses mentioned by men of Zaragoza, Nuevo León and the Spearman’s rank correlation coefficient ( r s )

From: Medicinal plants in the southern region of the State of Nuevo León, México

Age Number of species Number of uses
50 17 20
60 13 17
69 16 17
70 5 6
70 5 5
75 5 6
78 15 14
78 21 32
78 5 5
83 8 9
  r s = 0.92, α = 0.05 r s = 0.94 α = 0.05