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Outline
To establish vital capacity percentile reference values for students aged 6-18 in Renhuai City, Guizhou Province, using the LMS method; to compare these findings with national average levels for primary and secondary school students; and to analyze influencing factors and population characteristics, thereby providing a scientific basis for physical health interventions targeting local students.
The LMS method was employed to construct vital capacity percentile curves and reference values (P3, P10, P25, P50, P75, P90 and P97). Concurrently, multiple linear regression and K-means clustering analysis were utilized to investigate influencing factors and the characteristics of student subgroups.
A total of 109 072 students aged 6-18 were included in the study. The vital capacity curves for both boys and girls exhibited similar trends, increasing with age, with an accelerated growth rate observed during puberty. In comparison with national averages, the P50 values for boys were lower between ages 7 and 17 but exceeded the national average at age 18. For girls, P50 values were lower than the national average before age 14 but surpassed those after age 14. Significant variations in vital capacity were associated with BMI, boarding status, urban-rural residence, and ethnicity (R2=0.66, F=35 369.75, P<0.01). Specifically, vital capacity increased by an average of 191.5 ml for every 1-year increase in age and by 32.6 ml for every 1-unit increase in BMI. On average, females had a vital capacity 276.8 ml lower than males; The vital capacity of boarding students were 262.1 ml higher than non-boarding students; rural students were 23.3 ml lower than urban students; and ethnic minority students were 55.4 ml lower than Han students. Cluster analysis identified three distinct student subgroups. The “younger age, low BMI, non-boarding” group exhibited the lowest relative vital capacity (1 233.0 ml), while the “older age, high BMI, boarding” group demonstrated the highest (2 578.3 ml).
The application of LMS curves provide a valid reference standard for the health assessment of vital capacity among local adolescents. Education authorities should implement targeted interventions specifically aimed at younger students in rural areas and those with low BMI.
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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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