Table 1 Baseline characteristics women with IBD and RD
|  | Women IBD Frequency n = 31 (%)a | Women RD Frequency n = 58 (%)a |
|---|---|---|
Registration | ||
Mean age, years | 30 (25–38) | 32 (27–41) |
Country of origin | ||
 Western | 30 (97) | 56 (97) |
Education and work | ||
 Understanding of the Dutch language | 31 (100) | 57 (98) |
Education | ||
 Low | 12 (39) | 21 (36) |
 Intermediate | 12 (39) | 24 (41) |
 High | 7 (23) | 12 (21) |
Paid job | 28 (90) | 47 (81) |
Lifestyle and medical history | ||
 Smoking | ||
  No | 29 (94) | 54 (93) |
 Smoking of partner | ||
  No | 24 (77) | 51 (88) |
 Alcohol | ||
  Yes | 17 (55) | 20 (35) |
 Drugs | ||
  No | 29 (94) | 56 (97) |
 Folic-acid supplement | ||
  Yes, daily | 20 (65) | 43 (74) |
 Inflammatory bowel disease | ||
  Ulcerative colitis | 13 (42) | 0 (−) |
  Crohn’s disease | 17 (55) | 0 (−) |
  Other | 1 (3) | 0 (−) |
 Rheumatic disease | ||
  Rheumatoid arthritis | 0 (−) | 21 (36) |
  Ankylosing spondylitis | 0 (−) | 12 (21) |
  Juvenile idiopathic arthritis | 0 (−) | 6 (10) |
  Psoriatic arthritis | 0 (−) | 10 (17) |
  Spondylarthropathy | 0 (−) | 6 (10) |
  Other | 0 (−) | 1 (2) |
 Time since diagnosis | ||
   > 12 months | 30 (97) | 56 (97) |
Obstetric history | ||
 Mean number of pregnancies | 2.0 | 2.0 |
 Complicated pregnancy | 1 (3.2) | 11 (19) |
Miscarriage | ||
 Yes | 6 (19) | 18 (32) |
 No | 25 (81) | 37 (64) |
One of the next problems during pregnancy | ||
 Pre-term birth (<  37 weeks) | 1 (3) | 4 (7) |
 Birthweight < 2500 g | 1 (3) | 6 (10) |
 Birthweight > 4500 g | 2 (7) | 0 (−) |
 Congenital malformation | 0 (−) | 2 (3) |
 Perinatal asphyxia (Apgar 5 < 7) | 4 (13) | 4 (7) |
Perinatal mortality | ||
 No | 31 (100) | 58 (100) |
Contraception | ||
 Yes | 14 (45) | 14 (24) |
Actual wish to conceive | ||
 Pregnant at study entry | 10 (32) | 26 (45) |
 Within 3–12 months | 16 (52) | 16 (27) |
 Within 1–2 years | 4 (13) | 2 (3) |
 In 2 years or more | 0 (−) | 5 (9) |
 I don’t know | 0 (−) | 3 (5) |