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Table 2 Incidence rate of bacteriologically positive TB and associated risk factors among the elderly followed up, 2013–2015#

From: Incidence and risk factors of tuberculosis among the elderly population in China: a prospective cohort study

VariablesPerson-yearTB cases (n)Incidence(1/100 000 person-year)(95% CI)HRc (95% CI)HRa (95% CI)P
Total44 622.262138.9 (104.4–173.5)   
Gender
 Female23 959.12396.0 (56.8–135.2)1.001.00 
 Male20 663.139188.7 (129.5–248.0)1.97 (1.18–3.30)**1.47 (0.80–2.69)0.210
Age group
 65–7428 910.333114.2 (75.2–153.1)1.001.00 
  ≥ 7515 711.929184.6 (117.4–251.8)1.63 (0.99–2.69)1.50 (0.90–2.48)0.117
Nationality
 Han38 909.561156.8 (117.4–196.1)1.00  
 Others5703.3117.5 (0.4–97.7)0.21 (0.03–1.52)  
Education
 High school and above3536.94113.1 (30.82–289.5)1.00  
 Primary to secondary23 111.430129.8 (83.4–176.3)0.81 (0.29–2.32)  
 Illiteracy16 550.928169.2 (106.5–231.8)1.19 (0.42–3.40)  
Marital status
 Married32 515.449150.7 (108.5–192.9)1.00  
 Others$12 101.913107.4 (49.0–165.8)0.77 (0.42–1.42)  
Residence
 Local residents42 495.958136.5 (101.4–171.6)1.00  
 Others2126.34188.1 (51.3–481.6)2.46 (0.89–6.84)  
Annual average income per person in the family (RMB)
  ≥ 10 00019 617.422112.2 (65.3–159.0)1.00  
 2300–999917 234.128162.5 (102.3–222.6)1.35 (0.77–2.36)  
  < 23005708.912210.2 (91.3–329.1)1.95 (0.96–3.96)*  
Diabetes
 No41 653.362148.9 (111.8–185.9)1.00  
 Yes2968.900.0 (0–124.29)0.04 (0.00–3.73)  
Previously treated with TB
 No43 871.860136.8 (102.2–171.4)1.00  
 Yes750.42266.5 (32.3–962.2)1.70 (0.42–6.97)  
Chronic bronchitis
 No42 311.858137.1 (101.8–172.4)1.00  
 Yes2188.24182.8 (49.8–468.0)1.26 (0.46–3.49)  
Pneumoconiosis
 No44 500.562139.3 (104.6–174.0)1.00  
 Yes112.600.0 (0.0–3275.9)-#  
cigarette smoker
 Non-smoker35 608.938106.7 (72.8–140.7)1.001.00 
 Ex/current smoker9006.324266.5 (159.9–373.1)2.27 (1.36–3.78)**2.12 (1.27–3.54)0.004
alcohol drinker
 Non-drinker35 752.648134.3 (96.3–172.2)1.00  
 Ex/current drinker8827.014158.6 (75.5–241.7)1.06(0.58–1.92)  
BMI level
 18.5–23.927 380.239142.4 (97.7–187.1)1.001.00 
  < 18.54789.217355.0 (186.2–523.7)2.37 (1.34–4.19)**2.33 (1.32–4.12)0.004
  ≥ 2412 445.2648.2 (17.7–104.9)0.33 (0.14–0.77)**0.34 (0.14–0.80)0.014
  1. Those with missing values were excluded from analysis; TB Tuberculosis, HRc crude hazard ratio; HRa hazard ratio adjusted; *P ≤ 0.05; ** P < 0.01; *** P < 0.001. $Others included single, divorced and widowed. # Unavailable HRc because of no case for this group