Table 2.

Study 2: Risk ratio (RR) of incident participation restriction over 84 months (N=1810)

	Subjects n (%)	Crude RR [95%CI]	Multivariable Adjusted RR† [95%CI]
Positive Affect (Analysis 1)
Low	754 (41.7)	1.5**	1.2*
		[1.3, 1.8]	[1.0, 1.4]
High	1056 (58.3)	(ref)	(ref)
Negative Affect (Analysis 2)
High	632 (34.9)	1.8**	1.5**
		[1.5, 2.1]	[1.3, 1.7]
Low	1178 (65.1)	(ref)	(ref)
Combination (Analysis 3)
Low PA*High NA	413 (22.8)	1.0 [0.7, 1.3]	1.0 [0.8, 1.4]
Low PA/High NA		2.1**	1.8**
	342 (18.9)	[1.7, 2.5]	[1.4, 2.1]
Low PA/Low NA	220 (12.1)	1.3* [1.0, 1.7]	1.2 [0.9, 1.5]
High PA/High NA		1.7**	1.4**
	836 (46.2)	[1.3, 2.1]	[1.1, 1.8]
High PA/Low NA		(ref)	(ref)

PA: positive affect; NA: negative affect

^*p<.05

^**p<.01

^†All models adjusted for: sex, age, education, race, marital status, site, comorbidity, BMI, knee OA, 20-meter walk time, widespread pain, knee pain, knee stiffness; negative affect was adjusted for in model for analysis 1 and positive affect adjusted for in analysis 2