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. Author manuscript; available in PMC: 2015 Jul 1.
Published in final edited form as: J Forensic Sci. 2014 Feb 19;59(4):1020–1024. doi: 10.1111/1556-4029.12437

TABLE 1.

Mean (standard deviation) scores for pen movement stroke parameters for older writers grouped by age and the results from statistical analyses (F-ratio).

Age 60–69 yrs Age 70–79
yrs		 Age > 79
yrs		 F (p)
Stroke Duration 183 (8.9) 199 (9.7) 231 (22.8) 2.96 (<0.10)
Stroke Amplitude 1.7 (0.2) 1.3 (0.1) 1.0 (0.1) 2.88 (<0.10)
Stroke Velocity 12.0 (1.6) 8.8 (0.9) 7.2 (0.7) 3.95 (<0.05)
Relative Time to Peak Velocity 47.8 (0.5) 47.8 (0.4) 46.7 (0.8) 1.01 (>0.10)
Average Normalized Jerk 21.1 (2.2) 24.4 (2.9) 70.6 (35.6) 2.53 (<0.10)
No. Acc. Peaks/Stroke 2.3 (0.1) 2.5 (0.2) 3.0 (0.4) 2.56 (<0.10)
Pen Pressure 696.6 (30.5) 634 (26.1) 560.9 (32.9) 4.65 (<0.02)