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Table 4 Average age, according to type of study (N=79)

From: Motives for participating in a clinical research trial: a pilot study in Brazil

Type of study N Age (average) Standard deviation p-value2
     < 0.0001
Arthritis/osteoarthritis 24 56.7 8.4  
Bioequivalence 39 31.5 9.3  
Insomnia 10 48.2 12.4  
Other1 6 43.3 9.9  
  1. Included studies of menopause and temporomandibular pain;
  2. ANOVA.