. Author manuscript; available in PMC: 2015 Oct 8.

Published in final edited form as: Am J Obstet Gynecol. 2011 Jan 17;204(3):209.e1–209.e7. doi: 10.1016/j.ajog.2010.10.897

TABLE 2.

Demographic characteristics of study participants (n = 217)

Variable	n	Mean ± SD	Range
Age, y		36.83 ± 7.1	18.5–49.9
Age at menarche, y	216	12.5 ± 1.5	8–17
Duration of menses, d	214	7.0 ± 3.3	3–33
Race
White	169 (78%)
Black	35 (16%)
Other	13 (6%)
Anemia^a,^b	60 (39%)
Hemoglobin, g/dL^b		12.1 ± 1.5	7.4–15.6
Ferritin, ng/mL^b		20.6 ± 19.8	1–152
Pictorial blood assessment score		306.8 ± 237.6	100–2036

Hemoglobin <12 g;

n = 155.