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. Author manuscript; available in PMC: 2017 May 1.
Published in final edited form as: Fertil Steril. 2016 Jan 25;105(5):1294–1300. doi: 10.1016/j.fertnstert.2016.01.015

Table 1.

Patient characteristics for the overall sample and stratified by intermenstrual bleeding1

Characteristic Overall (n=549) No IM Bleeding (n=336) IM Bleeding (n=204) P value No luteal bleeding (n=357) Luteal bleeding (n=187) P value

Age (years) 0.99 0.90
 <35 68% 68% 69% 68% 69%
 35-37 19% 19% 18% 19% 18%
 >37 13% 13% 13% 13% 13%

Race 0.47 0.17
 Non-Hispanic Caucasian 77% 77% 75% 78% 73%
 Other 23% 23% 25% 22% 27%

Education level 0.83 0.64
 Less than college degree 7% 7% 8% 7% 8%
 College degree 20% 20% 19% 21% 17%
 Some graduate work 10% 10% 11% 10% 11%
 Completed postgraduate 63% 63% 62% 62% 64%

Gravid 0.59 0.24
 No 49% 48% 50% 47% 52%
 Yes 51% 52% 50% 53% 48%

BMI (kg/m2) 0.09 0.17
 <18.5 3% 2% 4% 2% 4%
 18.5-24.9 60% 58% 64% 57% 65%
 25-29.9 21% 24% 16% 24% 17%
 ≥30 16% 16% 16% 17% 14%

Current smoking 0.09 0.09
 No 99% 98% 100% 98% 100%
 Yes 1% 2% 0% 2% 0%

Attempt cycle at study entry 0.76 0.81
 1 17% 17% 16% 17% 17%
 2 43% 44% 41% 44% 40%
 3 22% 21% 25% 21% 25%
 4 12% 11% 12% 11% 12%
 5 6% 7% 5% 6% 6%

Recent hormone contraception2 0.59 0.93
 No 55% 54% 57% 55% 56%
 Yes 45% 46% 43% 45% 44%

Mean cycle length (days ± SD) 29 (2) 29 (2) 29(2) 0.67 29 (2) 29 (2) 0.47

Mean menses length (days ± SD) 5 (1) 5 (1) 5 (1) 0.77 5 (1) 5 (1) 0.58

Mean intercourse days (days ± SD) 7 (4) 7 (4) 6 (4) 0.26 7 (4) 6 (4) 0.34

Tested for pregnancy (at least once) 0.86 0.18
 No 42% 42% 43% 40% 47%
 Yes 58% 58% 57% 60% 53%

Partner’s age (years) 0.72 0.72
 <50 99% 98% 99% 98% 99%
 ≥50 1% 2% 1% 2% 1%

Partner race 0.54 0.92
 Non-Hispanic Caucasian 76% 74% 77% 75% 76%
 Other 24% 26% 23% 25% 24%

Partner education level 0.77 0.42
 Less than college degree 17% 18% 15% 18% 14%
 College degree 28% 29% 27% 30% 26%
 Some graduate/masters 9% 9% 9% 8% 10%
 Completed postgraduate 46% 44% 49% 44% 50%

IM, intermenstrual

1

Patient characteristics in the first complete study cycle

2

Oral contraceptive pills, contraceptive patch, or contraceptive vaginal ring use in the past year