The HYpertension and Diabetes in Yemen (HYDY) study is a National cross-sectional population-based survey to evaluate cardiovascular risk factors in subjects aged 6-65 years (n = 12247). AIM: to establish reference growth charts for waist circumference (WC) among Yemeni children and adolescents aged 6 to 19 years. Design and methods: data were collected in 2008 including 1550 females and 1564 males. Data collection was conducted at home in rural as well urban locations in three different geographic areas (highlands - governorate of Sana'a; inland - governorate of Taizz; and coast - governorates of Al Hudaydah and Hadramaut), by centrally trained investigators of both genders. Households were selected because in developing countries not all children have access to school. WC was measured with a non-elastic tape positioned at a point midway between the lower border of the rib cage and the top of the iliac crest. Measures have been taken to attain complete reliability and to reduce variation to reasonable limits. Data were checked for outliers using a cut-off of ± 5 SD of the corresponding age and sex Z-scores. Smoothed age and gender-specific percentiles (3rd, 5th, 10th, 25th, 50th, 75th, 90th, 95th, and 97th) for WC were constructed by means of the Box-Cox normal distribution (LMS method of centiles estimation). Results: the response rate was 96% in urban and 97% in rural locations. WC increased with age among both boys and girls (see table). Boys had a higher WC than girls until early adolescence (54.1 ± 7.7 vs. 53.1 ± 8.7 cm, p<0.09 respectively for subjects aged <=11 yrs). Thereafter girls had higher WC values than boys (65.5 ± 10.7 cm vs. 64.8 ± 10.0 cm, p<0.04 respectively for subjects aged >11 yrs). Girls had lower 50th and 90th WC than boys in younger ages (6-11 years), but higher in older ages (12-19 years). Conclusions: this study provides the first reference growth charts for waist circumference of Yemeni children and adolescents aged 6 to 19 years. In Yemen, where central obesity is more prevalent in women than men, gender related differences seems to originate at early adolescence when, differently from what observed in Western countries, waist circumference starts to increase more rapidly in girls than in boys.
REFERENCE GROWTH CHARTS FOR WAIST CIRCUMFERENCE AMONG YEMENI CHILDREN AND ADOLESCENTS AGED 6 TO 19 YEARS
Massetti Luciano;
2013
Abstract
The HYpertension and Diabetes in Yemen (HYDY) study is a National cross-sectional population-based survey to evaluate cardiovascular risk factors in subjects aged 6-65 years (n = 12247). AIM: to establish reference growth charts for waist circumference (WC) among Yemeni children and adolescents aged 6 to 19 years. Design and methods: data were collected in 2008 including 1550 females and 1564 males. Data collection was conducted at home in rural as well urban locations in three different geographic areas (highlands - governorate of Sana'a; inland - governorate of Taizz; and coast - governorates of Al Hudaydah and Hadramaut), by centrally trained investigators of both genders. Households were selected because in developing countries not all children have access to school. WC was measured with a non-elastic tape positioned at a point midway between the lower border of the rib cage and the top of the iliac crest. Measures have been taken to attain complete reliability and to reduce variation to reasonable limits. Data were checked for outliers using a cut-off of ± 5 SD of the corresponding age and sex Z-scores. Smoothed age and gender-specific percentiles (3rd, 5th, 10th, 25th, 50th, 75th, 90th, 95th, and 97th) for WC were constructed by means of the Box-Cox normal distribution (LMS method of centiles estimation). Results: the response rate was 96% in urban and 97% in rural locations. WC increased with age among both boys and girls (see table). Boys had a higher WC than girls until early adolescence (54.1 ± 7.7 vs. 53.1 ± 8.7 cm, p<0.09 respectively for subjects aged <=11 yrs). Thereafter girls had higher WC values than boys (65.5 ± 10.7 cm vs. 64.8 ± 10.0 cm, p<0.04 respectively for subjects aged >11 yrs). Girls had lower 50th and 90th WC than boys in younger ages (6-11 years), but higher in older ages (12-19 years). Conclusions: this study provides the first reference growth charts for waist circumference of Yemeni children and adolescents aged 6 to 19 years. In Yemen, where central obesity is more prevalent in women than men, gender related differences seems to originate at early adolescence when, differently from what observed in Western countries, waist circumference starts to increase more rapidly in girls than in boys.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
