Epidemiology Research International

Research Article

WHO European Childhood Obesity Surveillance Initiative: Impact of Type of Clothing Worn during Anthropometric Measurements and Timing of the Survey on Weight and Body Mass Index Outcome Measures in 6–9-Year-Old Children

Table 5

Mean BMI-for-age -score values in 6-, 7-, 8- and 9-year-olds in three countries with results of multiple comparisons procedures, by monthly period.


Monthly period	Mean BMI/ -score
Monthly period	6-year-olds	7-year-olds	8-year-olds	9-year-olds

Belgium, round 1
Sep. 2007	0.19	ND	ND	0.16
Oct. 2007	0.25	ND	ND	0.27
Nov. 2007	0.21	ND	ND	0.32
Dec. 2007	0.17	ND	ND	0.34
Jan. 2008	0.18	ND	ND	0.35
Feb. 2008	0.13	ND	ND	0.33
Mar. 2008	0.16	ND	ND	0.32
Apr. 2008	NS	ND	ND	0.34
Belgium, round 2
Sep. 2009	ND	ND	0.28	0.14
Oct. 2009	ND	ND	0.18	0.18
Nov. 2009	ND	ND	0.19	0.29
Dec. 2009	ND	ND	0.21	0.46
Jan. 2010	ND	ND	0.24	0.31
Feb. 2010	ND	ND	0.23	0.35
Mar. 2010	ND	ND	0.21	0.34
Apr. 2010	ND	ND	NS	0.23
May 2010	ND	ND	NS	0.28
June 2010	ND	ND	NS	0.37
Greece, round 2
Nov. 2010	NA	0.93	NA	ND
Dec. 2010	NA	1.04	NA	ND
Jan. 2011	NA	1.00	NA	ND
Feb. 2011	NA	0.84	NA	ND
Spain, round 2
Dec. 2010	ND	ND	0.73	ND
Jan. 2011	ND	ND	0.87	ND
Feb. 2011	ND	ND	0.90	ND
Mar. 2011	ND	ND	0.79	ND
Apr. 2011	ND	ND	1.04	ND

BMI: body mass index; BMI/: BMI-for-age; NA: not applicable, because this age group was not one of the country’s targeted age group; ND: not determined, because no statistically differences were found in mean value across monthly periods in this targeted age group; NS: not specified, because fewer than 5% of the total group of children for this age group were measured.
By country and round: within each age group mean values that share the same superscript letter do not statistically significantly differ from each other (Games-Howell post hoc test). For example, for the Belgian 9-year-old children in round 1, the mean value of the children who were measured in September 2007 significantly differ from the other seven monthly periods, whereas the mean values found in the monthly periods October 2007–April 2008 do not significantly differ from each other.