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Table 1 Subject characteristics (n = 939)

From: Long working hours and pregnancy complications: women physicians survey in Japan

  N %
Age at survey, years   
  ≤39 314 33
  40-48 306 33
  49≤ 319 34
Maternal age, years   
  <28 234 25
  28-29 181 19
  30-32 259 28
  33≤ 265 28
Specialty   
Internal medicine 283 30
  Dermatology 111 12
  Pediatrics 104 11
  Opthalmology 102 11
  OBGY 65 7
  Psychiatry 51 5
  Ear nose Throat 50 5
  Anesthesiology 35 4
  Has not decided yet 26 3
  Othersa 110 12
Any pregnancy complications   
  Overallb 394 42
   Threatened abortion 129 14
   Preterm birth 107 11
   Abnormal labor and delivery 72 8
   Spontaneous miscarriage 26 3
   Gestational hypertension 26 3
   Othersc 98 10
  No complication 541 58
  Do not remember 4 0
Current household income   
  Highest quintile 142 18
  Second highest quintile 417 52
  Middle 137 17
  Second lowest quintile 71 9
  Lowest quintile 30 4
Weekly working hours during the first trimester, mean (SD) 54 (22) hrs
  1. SD (standard deviation); The numbers in each category may not add up to the total if the data contain missing values.
  2. aOthers include Rehabilitation, Psychosomatic medicine, Palliative Care, Neurosurgery, Emergency medicine, Urology, Cosmetic surgery, Cardiovascular surgery, Surgery, Neurology, Orthopedic surgery, Family medicine, Plastic surgery, Radiology, Basic medicine.
  3. bPregnancy complications were not mutually exclusive here.
  4. cOthers included gynecological underlying illnesses such as uterine myoma and endometriosis, severe nausea, and other complications with internal organs like diabetes and tuberculosis.