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To understand the changes of height and growth retardation of students in nutrition improvement plan areas from 2012 to 2021 since the implementation of "Nutrition Improvement Plan for Students receiving Compulsory Education in Rural areas" in 2011, so as to provide a theoretical basis for better improvement of students’ health status and further decision-making.
The stratified cluster sampling method was used to evaluate nutritional status of the students in the monitored schools in Hebei Province by physical examination, monitoring their height and calculating the growth retardation rate.
In 2021, the average height of male and female students in the same age group increased by 3.62cm and 2.65cm on average compared with 2012. The height increase of boys and girls in the same age group was statistically different (all P<0.01). From 2012 to 2021, the peak of average height increase for boys was between the ages of 12 and 13, with an added value of 5.7cm, while that of girls was between the age of 11 and 12, with an added value of 4.3cm. From 2012 to 2021, the growth retarding rates of boys and girls decreased year by year, and the Chi-square linear trend test showed that the difference was statistically significant (Chi-square linear trend test all P<0.005).
From 2012 to 2021, the average height of students aged 6 to 15 years old in the areas under the nutrition improvement plan of rural students in our province increased. However, since the baseline data in 2012 was higher than the national level in rural areas, the height has tended to be stable in recent years, so the average growth rate of students is lower than the national level, and the growth retardation rate of students shows a decreasing trend year by year, and the growth retardation rate is lower than the national average level.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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