Table 1.

Assumptions of the outcome and suicide rates in Group 1 and Group 2

	Group 1	Group 2
Suicide rate in control regions (per 100,000 individuals)	30	20
Proportion of expected numbers of ambulance transports due to "self-harm" (severe and mild cases) relative to completed suicides	50%	50%
Expected suicide rate reduction over observed 3 years by intervention	20%	15%
Significance level (two-sided)	5%	5%

Notes. These assumptions of the outcome and suicide rates (2002–2004) are used to calculate the sample sizes in this study.

Group1: regions with a relatively high suicide rate compared to control regions, examined to gauge the effectiveness of the community-based multimodal intervention program for suicide prevention.

Group 2: highly-populated regions, examined in order to explore the effectiveness of the community-based multimodal intervention program for suicide prevention.