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Figure 1

Figure 1. From: Life-Style and Reproductive Factors Associated with Follicular Phase Length.

There were 201 women with a measurable follicular phase length in the first cycle of study participation. The geometric mean follicular phase length was 15.5 days, with an interquartile range of 12.0 to 19.0 days. The women ranged in age from 21–42 with a mean of 29. Age and recent oral contraceptive use showed a univariate association with follicular phase length, and thus were included in all subsequent models. The effect of age, however, was weakened when adjusted for recent oral contraceptive use, while recent oral contraceptive use remained important after adjustment for age (Table 1). Women with recent oral contraceptive use had a longer follicular phase (2.3 days, p=0.04). After adjusting for age and recent OC use, the only factors associated with follicular phase length were years of oral contraceptive use, a history of miscarriage and marijuana use. Follicular phase length generally increased with increasing duration of oral contraceptive use, with most of the increase occurring after 1 year of use. Among women who had ever been pregnant, those with a history of miscarriage had a shorter follicular phase (2.2 days, p=0.04). Marijuana use was associated with longer follicular phase length (p=0.04). Compared with non-users, occasional marijuana users had a follicular phase longer by 3.5 days, and more frequent users had a follicular phase longer by 1.7 days (Table 1, Figure 1).

Anne Marie Z. Jukic, et al. J Womens Health (Larchmt). ;16(9):1340-1347.

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