TABLE 1.

Descriptive statistics of study variables assessed at four time points throughout the study.

Variables	Baseline		Before interaction		During interaction		After interaction
	M	SD	M	SD	M	SD	M	SD
Primary measures
Heart rate	67.34	9.14			83.92	13.08
Pre-ejection period	118.05	11.41			107.97	11.89
Cardiac output	5.81	2.35			6.21	2.62
Cooperative behavior ($)							4.77	1.43
Partner liking			4.60	1.24			5.42	1.03
Inferred liking by partner			4.34	1.52			4.93	1.21
Positive affect	3.14	0.90	3.13	0.92	3.44	0.87	3.40	0.92
Negative affect	1.40	0.43	1.44	0.46	1.29	0.43	1.23	0.39
Anger expression					1.31	0.32
Anger suppression					1.60	0.35
Anger control					3.17	0.57
Testosterone (pg/mL)
Total sample	93.03	57.56			86.68	56.89	80.10	53.68
Males	139.88	54.80			132.90	54.03	125.00	48.81
Females	57.48	25.03			51.61	25.11	46.03	23.91
Exploratory measures
Demand/resource appraisals					80.00	22.58
Social touch (seconds)					0.57	0.31
Cortisol (ug/dL)
Total sample	4.83	3.54			3.71	2.43	3.39	2.25
Males	5.30	4.39			4.22	2.44	3.80	2.34
Females	4.48	2.71			3.32	2.37	3.08	2.15

Cardiovascular responses, cooperative behavior (the amount of money participants put in the common pot during the public goods provision task), and testosterone responses are the raw data before transformation. The results from the three exploratory measures are reported either as a footnote (see Footnote 4 for cortisol reactivity) or in the Supplementary Materials (for demand/resource appraisals and social touch, operationalized as the amount of time the dyad touched their hands during the tactile finger-spelling task). The second and third saliva samples were obtained at 18 and 33 min following the beginning of the in-person interaction, respectively.