This information is for reference purposes only. It was current when produced and may now be outdated. Archive material is no longer maintained, and some links may not work. Persons with disabilities having difficulty accessing this information should contact us at: https://info.ahrq.gov. Let us know the nature of the problem, the Web address of what you want, and your contact information.
Please go to www.ahrq.gov for current information.
Table 19. Menstrual Cycles at 6 and 12 Months
Menstrual Cycle |
Level |
0-6 Months |
6-12 Months |
Total N
(1,797) |
% |
Total N
(1,701) |
% |
Regularity of cycle |
Regular |
1,138 |
63.29 |
1,067 |
62.73 |
Irregular |
397 |
22.08 |
354 |
20.81 |
No periods |
256 |
14.24 |
273 |
16.05 |
Reason for no periods (N = 171) |
Medication |
8 |
4.68 |
19 |
7.76 |
Pregnancy |
1 |
0.58 |
4 |
1.63 |
Hysterectomy |
10 |
5.85 |
22 |
8.98 |
Spontaneous |
98 |
57.31 |
149 |
60.82 |
Other |
44 |
25.73 |
38 |
15.51 |
Return to Document
5600 Fishers Lane Rockville, MD 20857