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Table 2 Weekly working hours during the first trimester of pregnancy by any pregnancy complications

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

Variables Weekly working hours at pregnancy Pa
    Mean (SD)  
Any pregnancy complications   
  Overall 58 (23) hrs <.0001
   Threatened abortion 63 (22) hrs <.0001
   Preterm birth 62 (25) hrs 0.0003
  No complication 50 (21) hrs Referenceb
  1. aBased on t test.
  2. bThose who answered "do not remember" were excluded (n = 4).