title: Body mass index, recreational physical activity and female urinary incontinence in Gansu, China.
abstract: OBJECTIVE
  To elucidate the influence of recreational physical activity, body mass index (BMI), and waist circumference on the risk of specific types of urinary incontinence.
  
  
  METHODS
  We conducted a population-based cross-sectional survey in Gansu, China among 2603 women aged 20 years or older.
  
  
  RESULTS
  The study found that BMI was positively associated with urinary incontinence (P for trend=0.008) and the association was mainly observed for stress urinary incontinence (OR=1.4, 95% CI: 1.1, 1.9 for BMI=24.0-27.9 kg/m²; OR=2.3, 95% CI: 1.5, 3.6 for BMI ≥ 28.0 kg/m²; P for trend=0.0005). A positive association between stress incontinence (OR=1.7, 95% CI: 1.2, 2.5) and waist circumference was observed for women who had waist circumference between 70 cm and 75 cm compared to waist circumference less than 70 cm. Recreational physical activity was inversely associated with overall and mixed urinary incontinence (P for trend <0.0001 for both). A significant interaction between physical activity and waist circumference was found for overall (P=0.0007) and stress incontinence (P=0.001).
  
  
  CONCLUSIONS
  The findings that physical activity inversely associated with urinary incontinence and its interaction with waist circumference warrant further investigation, particularly in prospective studies.
authors.affiliation: Gansu Provincial Maternity and Child Care Hospital, 143 North Road, Qilihe District, Lanzhou, Gansu Province 730050, China.
authors.forename: Jie
authors.initials: J
authors.lastname: Qiu
authors.forename: Ling
authors.initials: L
authors.lastname: Lv
authors.forename: Xiaojuan
authors.initials: X
authors.lastname: Lin
authors.forename: Lixia
authors.initials: L
authors.lastname: Long
authors.forename: Daling
authors.initials: D
authors.lastname: Zhu
authors.forename: Ruifeng
authors.initials: R
authors.lastname: Xu
authors.forename: Xiaohui
authors.initials: X
authors.lastname: Deng
authors.forename: Zhiyuan
authors.initials: Z
authors.lastname: Li
authors.forename: Lan
authors.initials: L
authors.lastname: Zhu
authors.forename: Christopher
authors.initials: C
authors.lastname: Kim
authors.forename: Qing
authors.initials: Q
authors.lastname: Liu
authors.forename: Yawei
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015992:Body Mass Index; D002681:China / Q000453:epidemiology; D003430:Cross-Sectional Studies; D005260:Female; D006306:Health Surveys; D006801:Humans; D008875:Middle Aged; D009043:Motor Activity; D050177:Overweight / Q000503:physiopathology*; D015995:Prevalence; D011998:Recreation; D012306:Risk; D012720:Severity of Illness Index; D053201:Urinary Bladder, Overactive / Q000175:diagnosis / Q000453:epidemiology / Q000209:etiology / Q000503:physiopathology; D014549:Urinary Incontinence / Q000175:diagnosis / Q000453:epidemiology / Q000209:etiology*; D014550:Urinary Incontinence, Stress / Q000175:diagnosis / Q000453:epidemiology / Q000209:etiology; D053202:Urinary Incontinence, Urge / Q000175:diagnosis / Q000453:epidemiology / Q000209:etiology; D055105:Waist Circumference; D055815:Young Adult