Results

Survey outline

In this research, surveys were conducted targeting children between 9 and 13 years of age going to elementary schools in five capital city areas, as shown in Table 1.All of these are data based on the judgment sampling. Since it was possible to define the planned number of samples in surveys in Korea and Japan, the effective recovery ratio was calculated. The survey of Japan covered a total of 25 schools in Tokyo, and a total 5,307 effective samples were recovered. This represented an effective recovery ratio of 87.5%. Table 2 shows the periods during which surveys were conducted in the five countries. The Japan survey was implemented from January to February, 2011.

Table 1　Numbers of schools and children covered by this survey

  Number of schools surveyed No. of questionnaires
distributed 		Effective recovery number Effective recovery ratio
1. Germany Elementary schools in Berlin 6 - 376 -
2. United Kingdom Elementary schools in London 5
Elementary schools in Kent 9 		- 507 -
3. France Elementary schools in Paris 10 - 370 -
4. Korea Elementary schools in Seoul 2 1,247 1,171 93.9%
5. Japan All elementary schools in Tokyo C Ward 8
All elementary schools in Tokyo K City 19 		6,062 5,307 87.5%
Total Elementary schools Total: 59 - 7,731 -

*Blank fields in the table above indicate that the number of questionnaires distributed/effective recovery ratio cannot be calculated.

Table 2　Periods during which children were surveyed

Name of country Periods during which children were surveyed
1. Germany Interviews at two schools in Berlin: February to end of March, 2011
Other schools in Berlin: September to end of October, 2011
2. United Kingdom Schools in Croydon, London: November 1 to 30, 2010
Total of 14 other schools in London and Kent: September to end of November, 2011
3. France September to end of October, 2011
4. Korea Two schools in Seoul Special City: May 15 to June 10, 2011
5. Japan All 8 schools in Tokyo C Ward and all 19 schools in Tokyo K City: January 15 to end of February, 2011

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