Table 3. Comparison of Physical Measurement Scores for Surgical vs. Non-Surgical Subjects.

Physical Measures	Preoperative		6-Month Postoperative		1-Year Postoperative		Adjusted Effect Size* (Baseline)		Adjusted Effect Size** (Baseline & Covariates)
	SMPA	Non- SMPA	SMPA	Non- SMPA	SMPA	Non- SMPA	Effect Size	p-value	Effect Size	p-value
Grip Strength (kg)	5.7 (6)	8.5 (7)	4.6 (4)	9.6 (8)	6.2 (5)	9.8 (8)	−1.28	0.140	−1.46	0.132
Key (lateral) pinch (kg)	3.5 (2)	4.0 (2)	3.1 (2)	4.2 (2)	3.1 (2)	4.0 (2)	−0.25	0.268	−0.25	0.327
2-point (tip) pinch (kg)	2.5(2)	3.1 (2)	2.3 (1)	3.1 (2)	2.7 (2)	3.1 (2)	0.08	0.683	0.12	0.603
Three-jaw (palmar) pinch (kg)	2.6 (2)	3.1 (1)	2.4 (1)	3.2 (2)	2.5 (1)	3.1 (1)	0.02	0.934	−0.02	0.914
Jebson-Taylor (s) ♣	56 (27)	43 (10)	48 (19)	40 (11)	44 (16)	40 (10)	1.75	0.359	1.69	0.440

Abbreviations: SMPA, Silicone Metacarpophalangeal Joint Arthroplasty.

Cell values are means (SD).

^*Mean difference in the response variable (1 year change score) between the SMPA and Non-SMPA group, adjusting for the centered baseline values of the response variable.

^**Mean difference in the response variable (1 year change score) between the SMPA and Non-SMPA group, adjusting for the centered baseline value of the response variable, centered age, centered severity, education (high school and lower versus higher), and gender.

^♣Higher Jebson-Taylor scores correspond to worse outcome.