C1QTNF9 and hyperlipidemia: Quantitative data and ordinal data between two non-hyperlipidemia subgroups demonstrated positive correlation between serum CTRP9 concentration and serum levels of all APN isoforms (including tAPN, HMW, MMW, and LMW APN), age, HDL, and vitamin B12 (p < 0.01), and negative correlation with diastolic blood pressure and serum triglyceride levels (p < 0.01, Table 4).