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Table 3 Incidence rates and relative risk for active TB among elderlies 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 622.2215481.8 (417.4–546.2)   
Gender
 Female23 959.176317.2 (245.9–388.5)1.001.00 
 Male20 663.1139672.7 (560.9–784.5)2.11 (1.59–2.80)***1.78 (1.27–2.50)0.001
Age group
 65–7428 910.3121418.5 (344.0–493.1)1.001.00 
  ≥ 7515 711.994598.3 (477.3–719.2)1.42 (1.08–1.87)*1.33 (1.00–1.80)0.053
Nationality
 Han38 909.5157403.5 (340.4–466.6)1.001.00 
 Others5703.3581017.0 (755.2–1278.7)5.29 (3.77–7.41)***5.15 (3.52–7.54)< 0.001
Education
 High school and above3536.912339.3 (147.3–531.3)1.00  
 Primary to secondary23 111.4108467.3 (379.2–555.4)1.00 (0.55–1.82)  
 Illiteracy16 550.995574.0 (458.6–689.4)1.36 (0.74–2.49)  
Marital status
 Married32 515.4168516.7 (438.6–594.8)1.00  
 Others$121 01.947388.4 (277.3–499.4)0.82 (0.59–1.13)  
Residence
 Local residents42 495.9207487.1 (420.8–553.5)1.00  
 Others2126.38376.2 (162.3–741.2)1.44 (0.71–2.92)  
Annual average income per person in the family (RMB)
 ≥10 00019 617.463321.1 (241.8–400.5)1.001.00 
 2300–999917 234.193539.6 (430.0–649.3)1.53 (1.11–2.11)***1.32 (0.95–1.83)0.095
  < 23005708.941718.2 (498.4–938.0)2.29 (1.54–3.40)***1.48 (0.97–2.26)0.072
Diabetes
 No41 653.3206494.6 (427.0–562.1)1.00  
 Yes2968.99303.1 (138.8–575.3)0.62 (0.32–1.21)  
Previously treated with TB
 No43 871.8201458.2 (394.8–521.5)1.001.00 
 Yes750.4141865.7 (888.4–2843.0)3.70 (2.15–6.37)***3.18 (1.83–5.52)< 0.001
Chronic bronchitis
 No42 311.8199470.3 (405.0–535.7)1.00  
 Yes2188.216731.2 (372.9–1089.5)1.55(0.93–2.59)  
Pneumoconiosis
 No44 500.5213478.7 (414.4–542.9)1.00  
 Yes112.621755.6 (214.8–6409.8)3.65 (0.91–14.71)  
cigarette smoker
 Non-smoker35 608.9146410.0 (343.5–476.5)1.001.00 
 Ex/current smoker9006.369766.1 (585.4–946.9)1.77 (1.33–2.37)***1.48 (1.06–2.09)0.023
alcohol drinker
 Non-drinker35 752.6156436.3 (367.9–504.8)1.001.00 
 Ex/current drinker8827.059668.4 (497.9–839.0)1.37 (1.01–1.85)*0.941 (0.66–1.34)0.732
BMI level
 18.5–23.927 380.2147536.9 (450.1–623.7)1.001.00 
  < 18.54789.237772.6 (523.6–1021.5)1.39 (0.97–2.00)1.29 (0.88–1.88)0.194
  ≥ 2412 445.231249.1 (161.4–336.8)0.46 (0.31–0.67)***0.53 (0.35–0.79)0.002
  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