Table 2.

Prevalence of increased endometrial thickness according to reproductive and gynecologic history

CharacteristicsAll subjects (n = 1,271)
Not Current HRT users (n = 801)
Current HRT users (n = 461)
nET ≥3 mm (%)PnET ≥3 mm (%)PnET ≥3 mm (%)P
Parity
    Nulliparous10369.90.426360.30.443984.60.91
    Parous1,16166.873357.842082.6
    Unknown742.9540.0250
Age at menarche, y
    <1223871.00.7514266.20.139478.70.14
    12–1371365.246555.724482.8
    ≥1432067.819457.212385.4
Age at menopause, y
    <401468.40.061566.70.086366.70.43
    40–4942360.327750.914478.5
    ≥5081970.250661.730784.4
*10*3*7
Uterine fibroid
    Ever17676.10.0019367.70.0098385.50.56
    Never1,09465.470856.637782.0
*1*1
Oral contraceptive use
    Ever70565.00.2250558.60.6019181.70.29
    Never56669.429656.827083.3
HRT use
    Never58557.8<0.000158557.80
    Former21658.321658.30
    Current46182.6046182.6
*9
Years since menopause
    <527879.1<0.000113172.50.04514785.00.64
    5–932268.616255.615782.8
    10–1428662.919855.68578.8
    ≥1537559.230765
*10*3*7
  • NOTE: P indicates the statistical significance of differences in endometrial thickness (in mm), according to reproductive and gynecologic history, for all women, women not currently using HRT, and women currently using HRT. Status with respect to current HRT use was missing in nine instances. ET, endometrial thickness; *, missing.