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Table 1 Weight and weight-for-age Z-scores * of boys and girls aged 6–9 years in COSI Round 2 (2009/2010), by age and country

From: WHO European Childhood Obesity Surveillance Initiative: body mass index and level of overweight among 6–9-year-old children from school year 2007/2008 to school year 2009/2010

Age group and country Weight#(kg) W/A Z-score
  Boys Girls Boys Girls
  Mean (SD)
6-year-olds
 BEL 23.0 (3.7)§a 22.7 (3.9)a 0.35 (1.06)a 0.33 (1.00)a
 SVN 24.9 (4.6)§b 24.4 (4.6)b 0.70 (1.20)§b 0.62 (1.10)b
 ESP 24.9 (4.6)§b 24.5 (4.6)b 0.81 (1.19)b 0.72 (1.09)c
7-year-olds
 BEL 25.8 (5.0)§a 25.7 (5.4)a 0.40 (1.20)a 0.40 (1.13)a
 CZE 26.0 (4.8)§ab 25.3 (5.1)a 0.63 (1.17)§bc 0.51 (1.12)abc
 GRC 29.5 (5.8)§c 29.1 (6.1)b 1.17 (1.27)§d 1.05 (1.15)d
 HUN 26.7 (5.5)bde 26.4 (5.8)ac 0.57 (1.28)ab 0.54 (1.22)abc
 IRL 26.0 (4.2)§ad 25.6 (4.6)ac 0.53 (1.04)ab 0.51 (1.02)abc
 LVA 27.4 (5.3)§fg 26.5 (5.3)cd 0.63 (1.18)§b 0.45 (1.08)ac
 LTU 27.6 (5.3)§f 27.0 (5.5)d 0.68 (1.17)§bc 0.55 (1.09)bc
 PRT 27.0 (5.5)deg 27.2 (5.7)de 0.61 (1.25)b 0.66 (1.15)be
 SVN 27.8 (5.7)§f 27.1 (5.8)d 0.78 (1.25)§c 0.64 (1.14)b
 ESP 28.5 (5.7)§h 27.9 (5.8)e 0.96 (1.24)§e 0.81 (1.13)e
 MKD 27.6 (6.4)§ef 26.5 (6.4)c 0.70 (1.46)§bc 0.50 (1.32)ac
8-year-olds
 BEL 29.3 (5.5)§a 29.1 (5.9)a 0.45 (1.10)§a 0.40 (1.06)a
 ITA 32.3 (7.3)§b 31.6 (7.3)b 0.90 (1.31)§b 0.70 (1.22)b
 NOR 30.2 (5.7)§c 29.6 (5.6)c 0.69 (1.11)§c 0.56 (1.00)c
 SVN 31.8 (7.0)§d 31.1 (7.1)b 0.90 (1.26)§b 0.72 (1.16)b
 ESP 31.7 (6.4)bd 31.5 (6.7)b 0.91 (1.18)§b 0.79 (1.12)b
9-year-olds
 BEL 32.8 (7.3)a 32.9 (7.6)a 0.46 (1.18)§a 0.36 (1.18)a
 GRC 38.4 (8.9)§b 37.6 (9.1)b 1.30 (1.21)§b 1.02 (1.23)b
 IRL 33.0 (6.3)§ac 32.2 (6.9)a 0.63 (1.05)§c 0.37 (1.13)ac
 ITA 33.9 (7.8)§c 32.9 (7.6)a 0.79 (1.28)§d 0.53 (1.21)c
 LTU 34.7 (7.5)§d 33.7 (7.3)c 0.66 (1.12)§c 0.40 (1.09)a
 SVN 34.2 (7.9)cd 33.8 (8.0)c 0.85 (1.24)§de 0.68 (1.23)d
 ESP 35.9 (7.7)§e 35.2 (7.7)d 0.97 (1.13)§e 0.73 (1.12)d
  1. Abbreviations: ANOVA analysis of variance, COSI Childhood Obesity Surveillance Initiative, SD standard deviation, W/A weight-for-age, WHO World Health Organization.
  2. *Based on the 2007 WHO growth reference for school-age children and adolescents [17].
  3. Body weight was adjusted for clothes worn when measured and children with a W/A Z-score < −6 or > +5 were excluded.
  4. The country codes refer to the International Organization for Standardization (ISO) 3166–1 Alpha-3 country codes and countries were listed in alphabetical order by their full names: BEL, Belgium (Flanders); CZE, Czech Republic; GRC, Greece; HUN, Hungary; IRL, Ireland; ITA, Italy; LVA, Latvia; LTU, Lithuania; NOR, Norway; PRT, Portugal (all regions except Madeira); SVN, Slovenia; ESP, Spain; MKD, the former Yugoslav Republic of Macedonia.
  5. #Non-normally distributed and underwent inverse transformation prior to ANOVA and Games-Howell post hoc tests.
  6. †Statistically significant difference of mean value across countries for the indicated age group (one-way ANOVA; P < 0.0001).
  7. §Statistically significant difference of mean value between boys and girls for the indicated country (one-way ANOVA; P ≤ 0.05).
  8. a,b,c,d,e,f,g,hWithin each sex-age group (e.g. 6-year-old girls), 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 6-year-old girls, each mean W/A Z-score value is significantly different from the other two whereas the value of Belgian 6-year-old boys differed significantly from the other two and no significant difference was found between Slovenian and Spanish 6-year-old boys.