Table 1.

Item and factor loadings from exploratory factor analysis and descriptive statistics for the Partner Interaction Questionnaire (PIQ; n = 466)

Item	Factor I: emotional support	Factor II: complaints about smoking	Factor III: instrumental support	Factor IV: critical of smoker
Congratulate you on your decision to quit smokinga	0.723
Compliment you on not smokinga	0.823
Celebrate your quitting with youa	0.779
Help you calm down when you are feeling stressed or irritablea	0.612
Tell you to stick with ita	0.803
Express confidence in your ability to quit/remain quita	0.668
Express pleasure at your efforts to quita	0.890
Asked you to quit smokingb		0.762
Comment that smoking is a dirty habitb		0.758
Refuse to let you smoke in the houseb		0.483
Mentioned being bothered by smokeb		0.861
Criticize your smokingb		0.853
Refuse to clean up your cigarette buttsb		0.568
Participates in an activity with you that keeps you from smoking (e.g., going for a walk instead of smoking)a			0.565
Help you use substitutes for cigarettesa			0.797
Help you think of substitutes for smokinga			0.672
Talk you out of smoking a cigaretteb			0.556
Comment on your lack of will powerb				0.756
Express doubts about your ability to quit/stay quitb				0.852
Eigenvalue	6.308	3.856	1.180	1.062
Cronbach’s Alpha	0.867	0.829	0.763	0.715
Mean	20.10	12.27	7.81	2.60
(SD)	(6.47)	(7.16)	(3.99)	(2.30)

PIQ item “Commenting that the house smells of smoke” loaded onto factors II (0.408) and III (0.420) and is not shown here

^aItem included in the positive support behavior subscale of the two-factor PIQ

^bItem included in the negative support behavior subscale of the two-factor PIQ