title: Occupational lifting and pelvic pain during pregnancy: a study within the Danish National Birth         Cohort.
abstract: OBJECTIVE
  Pelvic pain during pregnancy is a common ailment, and the disease is a major cause of sickness         absence during pregnancy. It is plausible that occupational lifting may be a risk factor of pelvic pain during         pregnancy, but no previous studies have examined this specific exposure. The aim of this study was to examine the         association between occupational lifting and pelvic pain during pregnancy.
  
  
  METHODS
  The study comprised 50 143 pregnant         women, enrolled in the Danish National Birth Cohort in the period from 1996-2002. During pregnancy, the women         provided information on occupational lifting (weight load and daily frequency), and six months post partum on pelvic         pain. Adjusted odds ratios for pelvic pain during pregnancy according to occupational lifting were calculated by         logistic regression.
  
  
  RESULTS
  Any self-reported occupational lifting (>1 time/day and loads weighing >10 kg) was         associated with an increased risk of pelvic pain during pregnancy as compared to no such lifting. A confounder-adjusted         exposure-response relation was observed between self-reported total loads lifted and pelvic pain during pregnancy.         Daily lifting of both medium (11-20 kg) and heavy loads (>20 kg) were associated with increased risk, and the         highest risk was observed among women who lifted heavy loads independent of exposure to medium loads.
  
  
  CONCLUSIONS
  Occupational lifting may increase the risk of pelvic pain during pregnancy.
authors.affiliation: Section of Social Medicine, Department of Public Health, University of Copenhagen, Øster Farimagsgade 5, DK-1014 Copenhagen K, Denmark. pernillelarsen@sund.ku.dk.
authors.forename: Pernille Stemann
authors.initials: PS
authors.lastname: Larsen
authors.forename: Katrine
authors.initials: K
authors.lastname: Strandberg-Larsen
authors.forename: Mette
authors.initials: M
authors.lastname: Juhl
authors.forename: Susanne Wulff
authors.initials: SW
authors.lastname: Svendsen
authors.forename: Jens Peter
authors.initials: JP
authors.lastname: Bonde
authors.forename: Anne-Marie
authors.initials: AM
authors.lastname: Nybo Andersen
mesh_terms: D000041:Absenteeism; D000328:Adult; D015992:Body Mass Index; D003718:Denmark / Q000453:epidemiology; D015444:Exercise; D005260:Female; D006801:Humans; D017770:Lifting / Q000009:adverse effects*; D009784:Occupational Diseases / Q000453:epidemiology / Q000209:etiology*; D016273:Occupational Exposure / Q000009:adverse effects* / Q000706:statistics & numerical data; D016272:Occupational Health; D009790:Occupations / Q000706:statistics & numerical data; D017699:Pelvic Pain / Q000453:epidemiology / Q000209:etiology*; D011247:Pregnancy; D011248:Pregnancy Complications / Q000209:etiology*; D012307:Risk Factors