Table 4. Comparison of Arthritis Impact Measurement Scales 2 (AIMS2) Scores for Surgical vs. Non-Surgical Subjects.

AIMS2 Scale♣	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
Physical	4.0 (2)	2.4 (2)	3.4 (2)	2.5 (2)	3.3 (2)	2.4 (2)	0.24	0.261	0.28	0.241
Affect	4.1 (2)	3.0 (2)	3.7 (2)	2.7 (2)	3.7 (2)	2.7 (2)	0.03	0.895	0.23	0.343
Symptom	5.6 (3)	4.3 (2)	5.1 (3)	4.0 (3)	4.8 (3)	4.0 (3)	0.30	0.367	0.14	0.716
Social interaction	4.2 (2)	3.6 (1)	3.9 (2)	3.7 (1)	3.9 (2)	3.5 (1)	0.10	0.637	0.20	0.397

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.

^♣For all AIMS2 subscales, higher scores correspond to worse outcome.