Table 3.

Cronbach’s alpha coefficients for each domain at baseline and three months post-intervention.

	Domains (Number of Items)	Baseline	Three Months Post-Intervention
Primary outcomes
Pregnant women	Avoidance of environmental tobacco smoke: self-evaluation (19)	0.69	0.78
	Pregnant women’s behaviour change: peer-evaluation (3)	0.88	0.83
Male partners	Male partner’s smoking behaviour: self-evaluation (8)	0.78	0.70
	Male partner’s smoking behaviour: peer-evaluation (8)	0.69	0.70
Secondary outcomes
Pregnant women	Knowledge of SHS C (8)	0.70	0.71
	Perceived SHS-related disease susceptibility D (2)	0.83	0.83
	Perceived SHS-related disease severity E (2)	0.94	0.93
	Perceived benefits F (4)	0.92	0.86
	Barriers to preventing SHS exposure G (4)	0.67	0.71
	Cue to action for preventing SHS exposure H (6)	0.86	0.88
	Self-efficacy I (10)	0.92	0.91
Male partners	Knowledge of SHS C (8)	0.73	0.82
	Perceived SHS-related disease susceptibility D (2)	0.87	0.81
	Perceived SHS-related disease severity E (2)	0.90	0.92
	Perceived benefits F (4)	0.91	0.87
	Barriers to preventing SHS exposure G (5)	0.72	0.68
	Cue to action for preventing SHS exposure H (8)	0.82	0.86
	Self-efficacy I (10)	0.90	0.88