Factors affecting the results of the functional dexterity test.

STUDY DESIGN: Cross-sectional study. PURPOSE OF THE STUDY: The purpose of this study was to identify which demographic and anthropometric features affect performance (time) on the functional dexterity test (FDT). METHODS: One hundred fifty-two healthy subjects between the ages of 20 and 80 years were included in this cross-sectional study. Demographic characteristics (age, gender, height, weight, and dominant hand) and anthropometric (the girths of the first 3 fingers) variables were recorded, and the FDT (net time and total score) was performed. RESULTS: Hand dexterity (time) was slower in participants aged 60 years (35.7 ± 9.4 seconds) and older compared with those aged 40-59 (27.1 ± 7.2 seconds) years and 20-39 (23.9 ± 4.9 seconds) years (P < .001 for both) in dominant side. DISCUSSION: There was no significant difference between males (29.1 ± 9 in dominant hands and 30.9 ± 9.5 in nondominant hands) and females (27.9 ± 8.4 in dominant hands and 30.8 ± 8.1 in nondominant hands) in all groups in terms of FDT net time. The factors associated with hand dexterity were age in dominant hands (R2 = 0.321) and age and thickness of the second and third fingers in nondominant hands (R2 = 0.282). CONCLUSION: FDT scores increased with increasing age for both dominant and nondominant hands. Finger thickness, especially in nondominant hands, should be taken into account while evaluating FDT scores because of its negative effect on dexterity. LEVEL OF EVIDENCE: Level 2.