276 Table 11.1 Demographic and Obstetric characteristics of Adenomyosis patients versus the general Dutch population Characteristic Total Dutch Population (n=4,615,803) Adenomyosis Patients (n=7,925) p-value* Low-income area (%) 587,058 (12.8%) 959 (12.1%) P=0.078 Age of women at time of pregnancy (in Years, Mean (SD)) 30.42 (4.87) Mean 29.15 (4.43) P<0.001 Registered year of pregnancy (Mean (SD)) 2006 (6.80) 1999 (4.35) P<0.001 Ethnicity - Dutch/Caucasian - Mediterranean Creole/Hindustani/Asian - Other - Unknown 3,056,539 (79.6%) 431,571 (11.3%) <10% 776,448 (20.2%) 5,024 (87.1%) <10% 2,158 (37.4%) P<0.001 Obstetric Characteristics Gravidity (Median, (IQR)) 2 (2) 2 (2) P<0.001 Multiple gestation -0.9%** P<0.001 History of Miscarriage/Abortion (N, (%)) Number of previous miscarriages (Median, (IQR)) 1,226,139 (26.4%) 0 (1) 2,420 (30.4%) 0 (1) P<0.001 Parity - Median (IQR) - Primiparous - Multiparous - Grande multiparity (>5) 1 (1) 2,098,078 (45.7%) 0 (1) 4,928 (62.2%) 2,997 (37.8%) -0.4% P<0.001 Mode of Conception (N, (%)) - Spontaneous - Ovulation induction - Intra-uterine insemination - IVF/ICSI - Other - Unknown 2,536,563 (55.0%) 1,921,094 (41.6%) 5,217 (65.8%) +1.1% +0.3% +1.4% +0.1% 2,201 (27.8%) P<0.001 Reported subfertility +4.7% P<0.001 Gestational age at time of first consultation (in Weeks, Median (IQR)) 10 (5) 11 (4) P<0.001 Diagnosis of uterine fibroids prior to pregnancy +0.4% P<0.001 Pregnancy setting at the start of pregnancy (N, (%)) - Midwife - Hospital/Clinical - Unknown 3,955,220 (85.7%) 638,368 (13.8%) 6,040 (76.2%) 1,834 (23.1%) -0.3% P<0.001
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