. 2021 May 15;36(7):1784–1795. doi: 10.1093/humrep/deab049

Table I.

Demographic and reproductive characteristics, and medical history of study population; 528 ovulatory women without known subfertility, 1990–2013.

Total	No (%) 528
Demographic characteristics

Age (year) <30 • <20 • 20–24 • 25–29 ≥30 • 30–34 • ≥35	398 (75.4) 4 (0.8) 144 (27.3) 250 (47.3) 130 (24.6) 103 (19.5) 27 (5.1) Range: 18–40 IQR: 24–29 Median: 27 Mean (SD): 27.1 (4.1) Missing: 0
Race and ethnicity White (non-Hispanic) Hispanic/Latino Other Missing	465 (88.1) 26 (4.9) 33 (6.3) 4 (0.8)
Religion Catholic Protestant Latter-day Saint Other None Missing	383 (72.5) 59 (11.2) 41 (7.8) 27 (5.1) 12 (2.3) 6 (1.1)
Marital status Engaged Married Single/Other Missing	154 (29.2) 320 (60.6) 50 (9.5) 4 (0.8)
Completed education High school, vocational or technical school graduate or less Some college College graduate Missing	39 (7.4) 93 (17.6) 390 (73.9) 6 (1.1)
Employed Yes No Missing	415 (78.6) 106 (20.1) 7 (1.3)
Occupation Professional Clerical/Sales Homemaker Student Skilled and unskilled laborer/Other Missing	268 (50.8) 58 (11.0) 73 (13.8) 71 (13.4) 50 (9.5) 8 (1.5)
Income relative to US federal poverty level, adjusted by year <150% 150–200% >200% Missing	44 (8.3) 38 (7.2) 403 (76.3) 43 (8.1)

Reproductive history

Age at first menstruation (year) ≤10 11–14 ≥15 Missing	20 (3.8) 440 (83.3) 60 (11.4) 8 (1.5)
Age at first pregnancy (year) Never pregnant ≤19 20–24 25–29 ≥30 Missing	351 (66.5) 15 (2.8) 73 (13.8) 66 (12.5) 16 (3.0) 7 (1.3)
Parity Nulliparous Parous • 1 • ≥2 Missing	374 (70.8) 149 (28.3) 60 (11.4) 89 (16.9) 5 (0.9)
Spontaneous abortion None At least one Missing	477 (90.3) 43 (8.1) 8 (1.5)
Breast feeding (partial) Yes No Missing	23 (4.4) 505 (95.6) 0 (0.0)
Recent use of oral contraceptives (OCs) ≤60 days prior to 1st day of 1st cycle in study >60 days prior to 1st day of 1st cycle in study or didn’t use OCs within past year Missing	89 (16.9) 426 (80.7) 13 (2.5)

Medical history

Pelvic infection or sexually transmitted infection Yes No Missing	26 (4.9) 500 (94.7) 2 (0.4)
Vaginal infection (yeast infection) Yes No Missing	204 (38.6) 323 (61.2) 1 (0.2)
Cervical procedure, including cryotherapy, loop electrical excision, cauterization, colposcopy, biopsy Yes No Missing	14 (2.7) 514 (97.3) 0 (0.0)
Obstetrical/Gynecological surgery One or more procedures • Caesarean section • Dilation and curettage • Other, including laparoscopy No procedure Missing Current smoking^a Yes No Missing Current alcohol consumption^a Yes No	44 (8.3) 29 (5.5) 11 (2.1) 8 (1.5) 484 (91.7) 0 (0.0) 16 (5.8) 250 (90.2) 11 (4.0) 195 (70.4) 71 (25.6)
Missing	11 (4.0)

Total

No (%) 528

Demographic characteristics

Age (year)

<30

• <20

• 20–24

• 25–29

≥30

• 30–34

• ≥35

398 (75.4)

4 (0.8)

144 (27.3)

250 (47.3)

130 (24.6)

103 (19.5)

27 (5.1)

Range: 18–40

IQR: 24–29

Median: 27

Mean (SD): 27.1 (4.1)

Missing: 0

Race and ethnicity

White (non-Hispanic)

Hispanic/Latino

Other

Missing

465 (88.1)

26 (4.9)

33 (6.3)

4 (0.8)

Religion

Catholic

Protestant

Latter-day Saint

Other

None

Missing

383 (72.5)

59 (11.2)

41 (7.8)

27 (5.1)

12 (2.3)

6 (1.1)

Marital status

Engaged

Married

Single/Other

Missing

154 (29.2)

320 (60.6)

50 (9.5)

4 (0.8)

Completed education

High school, vocational or technical school graduate or less

Some college

College graduate

Missing

39 (7.4)

93 (17.6)

390 (73.9)

6 (1.1)

Employed

Yes

Missing

415 (78.6)

106 (20.1)

7 (1.3)

Occupation

Professional

Clerical/Sales

Homemaker

Student

Skilled and unskilled laborer/Other

Missing

268 (50.8)

58 (11.0)

73 (13.8)

71 (13.4)

50 (9.5)

8 (1.5)

Income relative to US federal poverty level, adjusted by year

<150%

150–200%

>200%

Missing

44 (8.3)

38 (7.2)

403 (76.3)

43 (8.1)

Reproductive history

Age at first menstruation (year)

≤10

11–14

≥15

Missing

20 (3.8)

440 (83.3)

60 (11.4)

8 (1.5)

Age at first pregnancy (year)

Never pregnant

≤19

20–24

25–29

≥30

Missing

351 (66.5)

15 (2.8)

73 (13.8)

66 (12.5)

16 (3.0)

7 (1.3)

Parity

Nulliparous

Parous

• 1

• ≥2

Missing

374 (70.8)

149 (28.3)

60 (11.4)

89 (16.9)

5 (0.9)

Spontaneous abortion

None

At least one

Missing

477 (90.3)

43 (8.1)

8 (1.5)

Breast feeding (partial)

Yes

Missing

23 (4.4)

505 (95.6)

0 (0.0)

Recent use of oral contraceptives (OCs)

≤60 days prior to 1st day of 1st cycle in study

>60 days prior to 1st day of 1st cycle in study or didn’t use OCs within past year

Missing

89 (16.9)

426 (80.7)

13 (2.5)

Medical history

Pelvic infection or sexually transmitted infection

Yes

Missing

26 (4.9)

500 (94.7)

2 (0.4)

Vaginal infection (yeast infection)

Yes

Missing

204 (38.6)

323 (61.2)

1 (0.2)

Cervical procedure, including cryotherapy, loop electrical excision, cauterization, colposcopy, biopsy

Yes

Missing

14 (2.7)

514 (97.3)

0 (0.0)

Obstetrical/Gynecological surgery

One or more procedures

• Caesarean section

• Dilation and curettage

• Other, including laparoscopy

No procedure

Missing

Current smoking^a

Yes

Missing

Current alcohol consumption^a

Yes

44 (8.3)

29 (5.5)

11 (2.1)

8 (1.5)

484 (91.7)

0 (0.0)

16 (5.8)

250 (90.2)

11 (4.0)

195 (70.4)

71 (25.6)

Missing

11 (4.0)

Not available for Creighton Model MultiCenter Fecundability Study (CMFS) 251 women (see Supplementary Table SI).