Table 1 Distribution (% and N) of key characteristics in AWHS.

From: Menstrual cycle length variation by demographic characteristics from the Apple Women’s Health Study

 

By participant (N = 12,608)

By cycle (N = 165,668)

Age (years)

Under 20

5.2 (651)

5.9 (9735)

20–24

14.7 (1853)

13.6 (22,493)

25–29

17.2 (2169)

15.5 (25,752)

30–34

19.2 (2424)

17.5 (29,038)

35–39

18.3 (2306)

19.2 (31,793)

40–44

14.2 (1787)

16.1 (26,685)

45–49

8.4 (1065)

9.5 (15,782)

Above 50

2.8 (353)

2.6 (4390)

Ethnicity

White

71.4 (8996)

71 (117,591)

Black

5.0 (633)

5.5 (9044)

Asian

4.3 (541)

4.7 (7856)

Hispanic

7.4 (928)

7.0 (11,652)

Other

2.2 (280)

2.2 (3658)

More than one ethnicity

9.8 (1230)

9.6 (15,867)

BMI

Underweight

2.6 (330)

2.7 (4457)

Healthy

36.8 (4636)

37.9 (62,747)

Overweight

25.9 (3263)

25.3 (41,995)

Class 1 obese

16.8 (2112)

16.9 (28,031)

Class 2 obese

9.7 (1223)

9.2 (15,295)

Class 3 obese

8.3 (1044)

7.9 (13,143)

  1. Values are presented as the percentage of the total participants or menstrual cycles included in this analysis.
  2. Age was calculated as age at enrollment for the By participant column and as age at each cycle for the By cycle column.
  3. The other ethnicity category includes American Indian or Alaska Native, Middle Eastern or North African, Native Hawaiian or Pacific Islander, or other unspecified ethnicity.
  4. Underweight was defined as BMI < 18.5 kg/m2. Healthy BMI was defined as 18.5 ≤ BMI < 25 kg/m2. Overweight was defined as 25 ≤ BMI < 30 kg/m2. Class 1 obese was defined as 30 ≤ BMI < 35 kg/m2. Class 2 obese was defined as 35 ≤ BMI < 40 kg/m2. Class 3 obese was defined as BMI ≥ 40 kg/m2.
  5. AWHS Apple Women’s Health Study, BMI body mass index.
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