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Chinese Journal of Antituberculosis ›› 2012, Vol. 34 ›› Issue (11): 731-735.

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Pulmonary tuberculosis incidence and its influencing factors in rural areas of Xiangtan county,Hunan province

ZHANG Chuan-fang, ZHANG Yi-rui, CHEN Tian-zhu, GONG De-hua, ZHAO Pei-an, ZENG Zheng-biao, TANG Yi, BAI Li-qiong   

  1. Department of Tuberculosis Control, Hunan Institute of Tuberculosis Control, Changsha 410013,China
  • Received:2012-05-11 Online:2012-11-10 Published:2013-02-06
  • Contact: BAI Li-qiong E-mail:liqiong99@126.com

Abstract: Objective  To study the pulmonary tuberculosis incidence and risk factors among  rural areas.  Methods  A nested case-control study was conducted based on cohort of 72 859 subjects in Xiangtan county of Hunan province. The case group was composed of 80 cases of new tuberculosis patients detected during the 1 year follow-up program. Four hundred nontuberculosis subjects were selected by simple random sampling method from the cohort as controls. Univariate analysis and mutivariate nonconditional logistic regression were used to analyze associations between the exposure factors and pulmonary tuberculosis. Results  The incidence of pulmonary tuberculosis was 109 80 per 100 000(80/72 859) within one year, the incidence of male and female was 168.11(63/37 476),48.05 per 100 000 (17/35 383) respectively. The results of univariate analysis showed that age (Wald χ2=22.251,P<0.001,OR=1.759), gender (Wald χ2=16.145,P<0.001,OR=0.310), educational level (Wald χ2=21.937,P<0.001,OR=0.468), marital status (Wald χ2=8.320,P=0.004,OR=0.358), occupation (Wald χ2=10.297,P=0.001,OR=0.377), history of TB exposure (Wald χ2=7.535,P=0.006,OR=4.166), history of tuberculosis (Wald χ2=14.637,P<0.001,OR=57.000), smoking history (Wald χ2=4.525,P=0.033,OR=1.730), suspicious symptoms (Wald χ2=46.630,P<0.001,OR=12.758) were significantly associated with TB incidence; multivariate analysis showed that gender (β=-1.142,Wald χ2=12.904,OR=0.319,95% CI=0.171-0.595), education level (β=-0.743,Wald χ2=14.355,OR=0.476,95% CI=0.324-0.699), marital status (β=-1.138,Wald χ2=7.537,OR=0.320,95%CI=0.142-0.722), history of tuberculosis (β=2.852,Wald χ2=5.563,OR=17.329,95%CI=1.619-185.441), suspicious symptoms (β=1.728,Wald χ2=16.333,OR=5.630,95%CI=2.435-13.016) were significantly associated with TB incidence.  Conclusion  Women, high education level and single were protective factors of TB incidence while history of tuberculosis and suspicious symptoms of tuberculosis were risk factors of TB incidence.

Key words: Tuberculosis, pulmonary/epidemiology, Incidence, Risk factors, Hunan province