Possibilities of Interpreting the Night-to-Day Ratio Specified by 24-Hour Blood Pressure Monitoring

Table 1

Classification accordance (%) of night decrease of blood pressure based on the definition night-to-day ratio (D, ND, ED, and R) specified from the quotient of values for 7 days and values for individual days and mode of classification in the individual days in a cohort of 40 healthy subjects without exercise.

No	Mean	Night-to-day ratio (%)				Accordance	Mode	Accordance
	7 days	R	ND	D	ED	7 : 1 day	7 days	7 : 1 day
1	ND	14	57	29		57	ND	57
2	ND	17	33	50		33	D	50
3	ND	14	29	57		29	D	57
4	D	14	29	57		57	D	57
5	D		43	57		57	D	57
6	D		29	71		71	D	71
7	D	14	14	71		71	D	71
8	D		14	86		86	D	86
9	D		17	83		83	D	83
10	D		14	86		86	D	86
11	D		14	86		86	D	86
12	D		14	57	29	57	D	57
13	D	14		43	43	43	ED	43
14	D		14	43	43	43	D/ED	43
15	D		17	33	50	33	ED	50
16	D			71	29	71	D	71
17	D			71	29	71	D	71
18	D		14	29	57	29	ED	57
19	D		17	33	50	33	ED	50
20	ED		50	50		50	D/ED	50
21	ND	14	43	43		43	D/ND	43
22	ND	14	29	57		29	D	57
23	ND	14	29	57		29	D	57
24	ND	14	14	57	15	14	D	57
25	ND		43	43	14	43	D/ND	43
26	D		57	29	14	29	ND	57
27	D		29	71		71	D	71
28	D		29	71		71	D	71
29	D		15	71	14	71	D	71
30	D		29	57	14	57	D	57
31	D		43	29	28	29	ND	43
32	D			86	14	86	D	86
33	D		15	71	14	71	D	71
34	D		14	57	29	57	D	57
35	D	14	14	43	29	43	D	43
36	D			71	29	71	D	71
37	D			57	43	57	D	57
38	D			71	29	71	D	71
39	ED			43	57	57	ED	57
40	ED			29	71	71	ED	71
Mean						55		62
Min-max						29–86		43–86

D: dipper, ND: nondipper, ED: extreme dipper, and R: risers (reverse dipper). Mode: classification based on the highest frequency of category occurrence across individual days. /: mode cannot be clearly specified.