Table 1.

An Overview of Study Characteristics.

Characteristic	Study 1	Study 2	Study 3
Target population	Couples who smoke	Inactive couples with excess weight or obesity	Couples with at least one partner having had a stroke
Time of data collection	February 2012 to June 2014	March 2012 to June 2014	March 2017 to November 2019
Number of couples analyzed	82	117	79
Age	19 to 71 years, M = 39 years	22 to 75 years, M = 46 years	33 to 88 years, M = 67 years
Relationship duration	M = 12 years	M = 19 years	M = 35 years
Study country	Switzerland	Switzerland	Canada
Daily diary design	32 days	28 days	14 days
Shared problematic behavior	Assessed as self-reported number of cigarettes smoked together	Assessed as objectively measured shared sedentary behavior (hourly data aggregated over evenings on weekdays or all day on weekends)	Assessed as number of servings of foods high in fat, sugar, and/or salt that both partners reported (separately) in an evening food log
Individual problematic behavior	7.5 cigarettes per day (SD = 5.3)	3.6 hours sedentary per day (SD = 1.0; only evenings for weekdays)	1.7 servings of foods high in fat, sugar, and/or salt per day (SD = 1.3)
Correlation of average individual problematic behavior between partners	r = .69, p < .001	r = .80, p < .001	r = .24, p = .003
Average time spent together	M = 7.3 hrs per day, SD = 3.0	M = 7.0 hrs per day, SD = 2.7	n/a
ICC closeness	0.27	0.43	0.52
ICC relationship satisfaction	0.31	0.45	0.50

Note. The ICC for binary outcomes in Study 1 reports the analysis of variance estimator. ICC = intraclass correlation.