To explore the level of non-high-density-lipoprotein-cholesterol (non-HDL-C) and prevalence of non-HDL-C hyperlipidemia in primary and middle school students of Science City Area, Mianyang, Sichuan Province.

From September to November 2015, a total of 3 241 cases of primary and middle school students of Science City Area, Mianyang, Sichuan Province were selected as research objects by cluster sampling method. According to the body mass index (BMI) growth curve of 0-18 years old children and adolescents in China, they were divided into obese group (n=326), overweight group (n=508) and control group (n=2 407). The age, body height, body weight and lipid level of the students were collected by cross-sectional study method. A total of 3 mL elbow vein blood was collected and the lipid level was detected. The level of non-HDL-C and prevalence of non-HDL-C hyperlipidemia among 3 groups were compared by statistical methods. Before surveying, the informed consents were obtained from guardians of all the students. There were no statistical differences among 3 groups in the age, gender ratio and so on (P>0.05).

①The effective rate of data collection was 99.3% (3 241/3 263). ②Among the 3 241 cases of primary and middle school students, the level of non-HDL-C was (2.46±0.63) mmol/L, the cutoff value of non-HDL-C hyperlipidemia was 3.58 mmol/L. The level of non-HDL-C in female students was (2.51±0.61) mmol/L, which was higher than (2.51±0.61) mmol/L in male students, and the difference was statistically significant (t=3.14, P<0.001). ③There was statistical difference among 3 groups in the level of non-HDL-C (F=85.04, P<0.001). And the levels of non-HDL-C in obese group and overweight group were higher than that in control group, and the level of non-HDL-C in overweight group was also higher than that in control group, all the differences were statistically significant (P<0.001). ④Among the 3 241 cases of primary and middle school students, the prevalence of non-HDL-C hyperlipidemia was 3.6% (116/3 241). There was no statistical difference in the prevalence of non-HDL-C hyperlipidemia between male and female students which was 3.3% (53/1 617) and 3.8% (62/1 624), respectively (χ²=0.54, P=0.462). The prevalence of non-HDL-C hyperlipidemia in obese group was 9.5% (31/326), which was higher than 3.7% (19/508) in overweight group and 2.7% (66/2 407) in control group, and both the differences were statistically significant (χ²=11.73, P<0.001; χ²=38.41, P<0.001). But there was no statistical difference in the prevalence of non-HDL-C hyperlipidemia between overweight group and control group (χ²=1.48, P=0.224).

The level of non-HDL-C in primary and middle school students of Science City Area, Mianyang, Sichuan Province is unoptimistic, and appropriate interventions should be taken to prevent the occurrence of non-HDL-C hyperlipidemia.