The effect of participatory community communication on HIV preventive behaviors among ethnic minority youth in central Vietnam

Table 3 The net differences in the percentage of HIV preventive ideation and behavior (condom use) between the two groups adjusted by PSM

Outcome variables	Number of blocks balance#	Non exposed group (A) N	Exposed group (B) N	Total	Net difference = B-A using "Atts" command %	Converting percentages into numbers
HIV preventive knowledge	6	623	117	800	7.4%**	210
HIV preventive ideation	6	623	117	800	12.7%**	361
Safer sex (condom use)	6	623	117	800	5.0%*	142

# indicating the number of balanced blocks in terms of characteristics or statistically insignificant difference in characteristics between non exposed group and exposed group, meaning that the propensity score was balanced when stratified into 6 blocks, which allow for calculating the net impact of the intervention as compared between the two groups. *P < 0.05; **P < 0.01; ***P < 0.001

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