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. 2021 Mar 27;106(9):e3748–e3759. doi: 10.1210/clinem/dgab204

Table 5.

Association of categorical AMH with luteal phase lengtha and long luteal phase

AMH (ng/mL) No. of cycles Adjusted Δ in luteal phase length, days (95% CI)b P value Adjusted a Δ in luteal phase length, days (95% CI)c P value Adjusted a Δ in luteal phase length, days (95% CI)d P value
<1.6 267 –0.19 (–1.03, 0.63) .639 –0.06 (–0.92, 0.80) .897 0.26 (–0.81, 1.33) .631
1.6-3.4 262 Reference
>3.4-8 254 0.46 (–0.36, 1.29) .268 0.34 (–0.50, 1.18) .424 0.49 (–0.57, 1.56) .364
>8 99 1.87 (0.78, 2.95) .001 1.80 (0.71, 2.88) .001 2.04 (0.54, 3.55) .008
Long luteal phase (≥18 days) aOR (95% CI) b aOR (95% CI) c aOR (95% CI) d aOR (95% CI) e
<1.6 213 0.55 (0.23, 1.28) 0.57 (0.25, 1.31) 0.86 (0.26, 2.82) 0.87 (0.33, 2.28)
1.6-3.4 206 Reference
>3.4-8 203 1.73 (0.81, 3.71) 1.52 (0.70, 3.32) 3.34 (0.90, 12.46) 1.93 (0.83, 4.51)
>8 82 2.89 (1.25, 6.67) 2.86 (1.26, 6.46) 5.08 (1.10, 23.38) 2.66 (1.01, 7.03)

Results are displayed as change in phase in days for a given AMH category, compared with the reference group.

a To achieve normality of the model residuals, the continuous analysis was limited to phases between 5 and 45 days long.

b Adjusted for age.

c Adjusted for age, race, education, BMI, time since oral contraceptive use, alcohol, smoking, and caffeine consumption.

d Sensitivity analysis of luteal phase length with ovulation determined by OPK (cycle N = 443).

e Sensitivity analysis the association of categorical AMH with long luteal phase weighted by the inverse of cycles contributed by each woman.