Table 7.

Morning BP change as a dependent variable: Univariate analysis

Difference in BP (mmHg)P Value
Dichotomous variable
 Men (versus women)1.820.09
 Overweight (BMI ≥25)2.720.02
 Obesity (BMI ≥30)5.440.02
 Antihypertensive medicine use2.210.21
 Diuretic use0.030.98
 Diabetes−1.820.09
 Proteinuria−0.340.83
 Nocturia−0.980.45
 Much difficulty in sleep−1.910.13
 Winter (versus summer)4.58<0.001
 CKD stage 4 (versus CKD stage 3)0.880.88
 CKD stage 5 (versus CKD stage 3)0.590.59
Continuous variables
 Age (10 yr)2.07<0.001
 BMI (1 kg/m2)0.480.001
 eGFR (10 ml/min per 1.73 m2)0.080.84
  • Morning BP change is defined as the difference between morning SBP (the average of SBPs during the first 2 hours) minus the lowest SBP (the average SBPs of three readings centered on the lowest night-time readings). Simple linear regression analysis was used for univariate evaluations to detect the factors associated with morning BP change. BMI, body mass index; eGFR, estimated GFR.