Table 3.

ET vs. PD – Main measures with patients removed who took carbidopa/levodopa within 12 h of exam.

	ET patients (n = 50)	PD patients (n = 11)	Significance
Proximal – distal postural tremora	0.47 ± 1.35	−0.32 ± 0.25	MW = 2.86, p = 0.004
Straight wrist – MCP postural tremor	0.24 ± 0.89	−0.27 ± 0.34	MW = 2.06, p = 0.04
Winged wrist – MCP postural tremor	0.40 ± 0.73	−0.14 ± 0.39	MW = 2.46, p = 0.01
Overall wrist – MCP postural tremorb	0.42 ± 0.83	−0.27 ± 0.83	MW = 3.02, p = 0.003
Wrist flexion/extension tremor – wrist pronation/supinationc	0.73 ± 0.93	0.00 ± 0.39	MW = 3.03, p = 0.002
Isolated postural thumb tremord,e
Liberal definition	0 (0%)	0 (0%)	χ2 = 0.00, p = 1.00
Conservative definition	0 (0%)	0 (0%)	χ2 = 0.00, p = 1.00
Intention tremor (present)f	42 (84%)	2 (18%)	χ2 = 19.43, p < 0.001

MW = Mann–Whitney test.

χ² = Chi-square test.

^aCalculated as follows. The highest WHIGET postural tremor score in each joint (regardless of direction, hand, or postural position) was summed separately for proximal vs. distal joints. The difference of these two sums was designated as “proximal – distal postural tremor.”

^bCalculated as follows. The highest WHIGET postural tremor score in the wrist (regardless of direction, hand, or postural position) was determined. The highest WHIGET postural tremor score in the MCP joint was also determined. The difference of these two values was designated as “wrist – MCP postural tremor.”

^cTo assess this, we used the highest WHIGET tremor scores, and calculated difference between wrist flexion-extension postural tremor and wrist pronation-supination postural tremor (wrist flexion/extension tremor – wrist pronation/supination tremor).

^dDefined liberally as a WHIGET score ≥ 0.5, and conservatively as a WHIGET score ≥ 1.

^ePresence of postural thumb tremor in the absence of all other postural tremor.

^fUsing a definition of present as a WHIGET score ≥ 1.