title: [A matched case-control study of papillary thyroid carcinoma].
abstract: OBJECTIVE
  In order to explore the risk factors of the papillary thyroid carcinoma(PTC), a hospital-based matched case-control study was carried out in Shanghai.
  
  
  METHODS
  Matched by gender, age (+/- 3 years old) and native place,205 pairs of cases and controls were recruited and studied. Database was established with Epi Info 6.0 software. Univariate and multivariate conditional logistic regression analysis were carried out with SPSS 11.5 software.
  
  
  RESULTS
  Data from multivariate conditional logistic regression analysis showed that often drinking tea and having better economic living standard 20 years ago were protective factors of PTC, with ORs of 0.456 and 0.221 respectively. Personal history of CT examination, familial history of cancer and the mother's age was older than 22 years when the research subject was delivered, were risk factors of PTC, with ORs of 12.935, 7.027 and 3.729 respectively. Results data from multivariate analysis on female subjects showed that the history of CT examination, mother's age was older than 22 (when the subject was delivered) and the history of gynecological disease were the risk factors of PTC,with ORs of 107.453,29.246 and 59.521 respectively. Taking bean products frequently and having higher standard of living 20 years ago were the protective factors of PTC,with ORs of 0.025 and 0. 144 respectively.
  
  
  CONCLUSIONS
  History of CT examination, familial history of cancer and the mother's age(older than 22 when the subject was delivered) were the risk factors of PTC. Frequent tea drinking habit and having higher standard of living 20 years ago were the protective factors of PTC. History of CT examination,mother's age (older than 22 when the subject was delivered) and the history of gynecological disease appeared the risk factors of PTC for women. Habit on frequent bean products taking and had higher standard of living 20 years ago were the protective factors of PTC to women.
authors.affiliation: Department of Epidemiology, Shanghai Institute of Planned Parenthood Research, Shanghai 200032, China.
authors.forename: Qian-xi
authors.initials: QX
authors.lastname: Zhu
authors.forename: Jian-chao
authors.initials: JC
authors.lastname: Bian
authors.forename: Qiang
authors.initials: Q
authors.lastname: Shen
authors.forename: Hong-wei
authors.initials: HW
authors.lastname: Tang
authors.forename: Hong-wei
authors.initials: HW
authors.lastname: Zhang
authors.forename: Yi
authors.initials: Y
authors.lastname: Wu
mesh_terms: D002291:Carcinoma, Papillary / Q000453:epidemiology*; D016022:Case-Control Studies; D002681:China / Q000453:epidemiology; D004032:Diet; D005260:Female; D006801:Humans; D008297:Male; D012307:Risk Factors; D012923:Social Class; D013964:Thyroid Neoplasms / Q000453:epidemiology*