APOB and depressive symptom measurement: The mean and standard deviation (Mean ± SD) of age of illness onset, age of first hospitalization, self-rating depression scale (SDS) and self-rating anxiety scale (SAS) standards score, and serum ApoB levels in depressive patients were 31.30 ± 10.23 years, 33.67 ± 10.54 years, 61.77 ± 12.73, 52.00 ± 12.14, and 0.86 ± 0.21 g/L.