Table 4.

Adjusted odds ratios of combined variable of comorbidity and attitudes to aging for Low QoL

	N	Generic QoL OR (95 % CI)	Older-specific QoL OR (95 % CI)
Positive attitude + no comorbidity (ref.)	67	1.0	1.0
Positive attitude + comorbidity	45	0.6 (0.2: 1.9)	1.1 (0.4: 3.3)
Not positive attitude + no comorbidity	109	5.8 (2.7: 12.2)	8.0 (3.5: 18.0)
Not positive attitude + comorbidity	140	11.2 (5.3: 23.3)	16.2 (7.2: 36.5)
Synergy indexa		2.3 (1.1: 4.6)	2.1 (1.1: 4.0)

Low QoL was defined as a QoL score being less than the median score on each QoL measure for all participants

Logistic regression adjusted for age, gender, education, and living arrangements

OR odds ratio, CI confidence interval, ref reference

^aIn the absence of an additive interaction effect, the synergy index equals 1