Table 1.

Demographic, behavioral, anthropometric and menopause transition stage characteristics of Study of Women’s Health Across the Nation (SWAN) Phytoestrogen Study participants in the current analysis^a, ^b

Participant Characteristics	Analysis Sample (N = 1586–1616)^c
Categorical Variables, percent
Menopause Transition Stage
Pre	59.55
Early Peri	40.45
Race
Black	30.69
Caucasian	47.15
Chinese	11.14
Japanese	11.01
Educational Level
Less than high school	3.87
High school	15.97
Some college	32.69
College	23.39
More than college	26.08
Difficulty paying for basics
Very hard	7.00
Somewhat hard	28.31
Not hard at all	64.69
Language used in reading/speaking
Other than English	4.96
Bilingual	7.56
English only	87.48
Current cigarette smoking	14.68
Alcohol use in past year
Abstinent	51.18
1–7 drinks per week	41.40
7+ drinks per week	7.43
Current use of a CNS-active medication^d	8.17
Continuous variables, mean (SD)
Age, years	45.64(2.61)
Body Mass Index (kg/m²)	27.94(7.43)

Eligibility criteria for inclusion in analysis sample were: 1) Part of SWAN Phytoestrogen Study cohort (see methods for derivation); 2) Cognitive data collected according to protocol standards at one or more visits (follow-ups 4, 6, 7, 8, 9 or 10); 3) No self-reported stroke through the 4^th follow-up visit; 4) No self-reported hormone use from SWAN baseline through the 4^th follow-up visit; 5) Menopause status able to be determined (see methods for explanation); Women who reported a stroke, started hormones or whose menopause status became unclassifiable were censored from analysis at the time of occurrence of these events.

Values in table are based on data from cohort baseline data, rather than visit 4, because 10 women in analytic sample did not attend the 4^th follow-up visit and because some characteristics were measured only at cohort baseline.

Of the 1616 women in the analytic sample, 1467 began the study at the 4^th follow up visit and 149 entered the study at a later visit (visit 6, 7, 8, 9 or 10).

Central nervous system (CNS) active medicines included: soporifics, anxiolytics and antidepressants.