Table 2.

Distribution of Sleep-Wake BP Ratio by Gender

Night-Day BP Ratio*	Women	Men	Total
<.8	0	3 (10%)	3 (4%)
0.8–.89	9 (22%)	4 (14%)	13 (19%)
.9–.99	25 (61%)	15 (52%)	40 (57%)
≥1	7 (17%)	7 (24%)	14 (20%)
Total	41	29	70

Notes: BP = blood pressure.

^*Night-day BP ratio values (35, 36): Normal ratio is between .8 and .9, indicating a blood pressure decrease during sleep by 10%–20%. A ratio ≥.9 suggests loss of the normal decline in nocturnal BP whereas a ratio ≥1 depicts sleep BP equal or greater than wake-time BP. A ratio of <.8 indicates excessive drop in BP during sleep.