A contraceptive idea based on the fact that ovulation occurs 14 days before the onset of the next menstrual period, and on the unreliable assumption that the length of future menstrual periods can be predicted on the basis of previous cycles. See also CONTRACEPTION.
Strong correlations were found between age and education level and the use of the calendar method at last intercourse: Women in the two older age-groups were more likely than the youngest women to have used this method (2.
However, greater education was associated with less method nonuse and more use of the calendar method.
2011) have compared real-time and calendar methods to assess drinking outcomes.
Taken together, these findings suggest that although calendar methods appear to be less accurate in capturing day-to-day variations in drinking patterns and may underestimate consumption, especially in cases of longer recall periods, they seem to be adequate for capturing aggregate measures of drinking outcome.