DDAH1 and depressive symptom measurement: Other than the AGXT2 and DDAH1 genotypes, the following parameters were significantly associated with SBP (sex [p <  0.001], body mass index [BMI; p = 0.020], depression [p = 0.026], head injury [p = 0.022], and total cholesterol [p = 0.003]) and with DBP (age [p = 0.03], sex [p = 0.002], BMI [p = 0.002], kidney disease [p = 0.004], depression [p = 0.042], and total cholesterol [p = 0.026]).