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Table 1 Characteristics of the women

From: Premenstrual symptoms in young adults born preterm at very low birth weight - from the Helsinki Study of Very Low Birth Weight Adults

Characteristic VLBW
(N = 86)
mean (SD)
term
(N = 101)
mean (SD)
P Value a
Birth    
   Birth weight, g 1125 (232) 3569 (474) < 0.0001
   Gestational age, wk 29.4 (2.4) 40.3 (1.1) < 0.0001
   Standard deviation score for birth weight -1.35 (1.60) 0.08 (1.04) < 0.0001
   SGAb, n (%) 21 (24.4%) 0 < 0.0001
   Maternal preeclampsiac, n (%) 19 (22.0%) 6 (5.9%) 0.001
   Twin, n (%) 13 (15.1%) 0 < 0.0001
   Triplet, n (%) 4 (4.7%) 0 < 0.0001
Parental    
   Maternal smoking during pregnancy, n (%) 15 (17.4%) 13 (12.9%) 0.4
   Highest education of either parentd, n (%)    0.2
Elementary 12 (14.0%) 9 (8.9%)  
High school 20 (23.3%) 16 (15.8%)  
Intermediate 32 (37.2%) 36 (35.6%)  
University 22 (25.6%) 39 (38.6%)  
Current    
   Age, y 22.4 (2.1) 22.6 (2.3) 0.5
   Height, cm 162.0 (7.6) 165.8 (13.5) 0.02
   Weight, kg 58.3 (11.8) 63.8 (10.9) 0.001
   BMI, kg/m2 22.1 (3.7) 22.7 (3.7) 0.2
   Daily smoking, n (%) 19 (22.1%) 30 (29.7%) 0.2
   Menarche, y 12.7 (1.5) 12.4 (1.4) 0.1
   Regular menstrual cyclee, n (%) 51 (65.4%) 60 (65.9%) 0.9
   Duration of menorrheaf, d 5.7 (2.8) 5.1 (1.8) 0.07
   Hormonal contraception, n (%) 42 (48.8%) 56 (55.4%) 0.4
Contraceptive pills 37 (43.0%) 48 (47.5%)  
Hormone releasing intrauterine device 2 (2.3%) 2 (2.0%)  
Implantable contraceptive 0 1 (1.0%)  
Other or unknown type of hormonal contraception 3 (3.5%) 5 (5.0%)  
   Treatment for mental disorders during previous three monthsg, n(%) 11 (12.8%) 6 (5.9%) 0.1
Depression 6 (7.0%) 5 (5.0%) 0.8
Anxiety or panic disorder 9 (10.5%) 5 (5.0%) 0.2
Eating disorder 3 (3.5%) 1 (1.0%) 0.2
Obsessive-compulsive disorder 0 1 (1.0%)  
  1. a) The t-test for continuous and chi-square test for categorical variables.
  2. b) Small for gestational age, birth weight < -2 SD.
  3. c) Data missing for one term participant.
  4. d) Data missing for one term participant.
  5. e) Menstrual cycle is regular when its duration is 21 to 35 days [22]. Data missing for 8 VLBW and 10 term participants.
  6. f) Duration of last bleeding. Data missing for 7 VLBW and 5 term participants.
  7. g) These participants were excluded from analysis of premenstrual symptoms.