Table 2.

Tracking coefficients of office BP, ABP, BPV and nocturnal BP fall (dipping) in all subjects

	SBP Tracking coefficient (95% CI)	DBP Tracking coefficient (95% CI)	PP Tracking coefficient (95% CI)
Office BPa	0.54 (0.49, 0.60)	0.46 (0.41, 0.51)	0.51 (0.46, 0.56)
ABP a
24 h	0.55 (0.50, 0.60)	0.57 (0.51, 0.62)	0.59 (0.53, 0.64)
Daytime	0.50 (0.45, 0.55)	0.49 (0.44, 0.55)	0.55 (0.50, 0.60)
Night time	0.37 (0.31, 0.42)	0.30 (0.23, 0.36)	0.50 (0.44, 0.55)
BPV b
24-h s.d.	0.20 (0.14, 0.25)	0.28 (0.22, 0.33)	—
Daytime s.d.	0.08 (0.02, 0.13)	0.21 (0.15, 0.26)	—
Night-time s.d.	0.08 (0.03, 0.13)	0.11 (0.06, 0.16)	—
Weighted 24-h s.d.	0.09 (0.04, 0.15)	0.21 (0.16, 0.27)	—
Dipping a
1. Day–night	0.12 (0.07, 0.18)	0.09 (0.04, 0.15)	—
2. (Day–night)/day	0.11 (0.06, 0.17)	0.07 (0.02, 0.12)	—
3. Dipper vs. non-dipperc	1.73 (1.39, 2.16)	1.60 (1.17, 2.18)	—

Abbreviations: ABP, ambulatory blood pressure; BPV, blood pressure variability; DBP, diastolic blood pressure; PP, pulse pressure; SBP, systolic blood pressure.

P-value for tracking coefficients is ≤0.001.Tracking coefficient is the standardized regression coefficient for continuous variables.

^aAll the tracking coefficients were adjusted for age, gender, ethnicity and family history of essential hypertension.

^bAll the tracking coefficients were adjusted for age, gender, ethnicity, family history of essential hypertension and mean BP.

^cOdds ratio for dichotomous dipping (dipper: those whose night-time BP drop is >10% of the daytime values; non-dipper: those whose night-time BP drop is <10% of the daytime values).