Table 2 Incidence rate of bacteriologically positive TB and associated risk factors among the elderly followed up, 2013–2015#
Variables | Person-year | TB cases (n) | Incidence(1/100 000 person-year)(95% CI) | HRc (95% CI) | HRa (95% CI) | P |
|---|---|---|---|---|---|---|
Total | 44 622.2 | 62 | 138.9 (104.4–173.5) |  |  |  |
Gender | ||||||
 Female | 23 959.1 | 23 | 96.0 (56.8–135.2) | 1.00 | 1.00 |  |
 Male | 20 663.1 | 39 | 188.7 (129.5–248.0) | 1.97 (1.18–3.30)** | 1.47 (0.80–2.69) | 0.210 |
Age group | ||||||
 65–74 | 28 910.3 | 33 | 114.2 (75.2–153.1) | 1.00 | 1.00 |  |
  ≥ 75 | 15 711.9 | 29 | 184.6 (117.4–251.8) | 1.63 (0.99–2.69) | 1.50 (0.90–2.48) | 0.117 |
Nationality | ||||||
 Han | 38 909.5 | 61 | 156.8 (117.4–196.1) | 1.00 |  |  |
 Others | 5703.3 | 1 | 17.5 (0.4–97.7) | 0.21 (0.03–1.52) |  |  |
Education | ||||||
 High school and above | 3536.9 | 4 | 113.1 (30.82–289.5) | 1.00 |  |  |
 Primary to secondary | 23 111.4 | 30 | 129.8 (83.4–176.3) | 0.81 (0.29–2.32) |  |  |
 Illiteracy | 16 550.9 | 28 | 169.2 (106.5–231.8) | 1.19 (0.42–3.40) |  |  |
Marital status | ||||||
 Married | 32 515.4 | 49 | 150.7 (108.5–192.9) | 1.00 |  |  |
 Others$ | 12 101.9 | 13 | 107.4 (49.0–165.8) | 0.77 (0.42–1.42) |  |  |
Residence | ||||||
 Local residents | 42 495.9 | 58 | 136.5 (101.4–171.6) | 1.00 |  |  |
 Others | 2126.3 | 4 | 188.1 (51.3–481.6) | 2.46 (0.89–6.84) |  |  |
Annual average income per person in the family (RMB) | ||||||
  ≥ 10 000 | 19 617.4 | 22 | 112.2 (65.3–159.0) | 1.00 |  |  |
 2300–9999 | 17 234.1 | 28 | 162.5 (102.3–222.6) | 1.35 (0.77–2.36) |  |  |
  < 2300 | 5708.9 | 12 | 210.2 (91.3–329.1) | 1.95 (0.96–3.96)* |  |  |
Diabetes | ||||||
 No | 41 653.3 | 62 | 148.9 (111.8–185.9) | 1.00 |  |  |
 Yes | 2968.9 | 0 | 0.0 (0–124.29) | 0.04 (0.00–3.73) |  |  |
Previously treated with TB | ||||||
 No | 43 871.8 | 60 | 136.8 (102.2–171.4) | 1.00 |  |  |
 Yes | 750.4 | 2 | 266.5 (32.3–962.2) | 1.70 (0.42–6.97) |  |  |
Chronic bronchitis | ||||||
 No | 42 311.8 | 58 | 137.1 (101.8–172.4) | 1.00 |  |  |
 Yes | 2188.2 | 4 | 182.8 (49.8–468.0) | 1.26 (0.46–3.49) |  |  |
Pneumoconiosis | ||||||
 No | 44 500.5 | 62 | 139.3 (104.6–174.0) | 1.00 |  |  |
 Yes | 112.6 | 0 | 0.0 (0.0–3275.9) | -# |  |  |
cigarette smoker | ||||||
 Non-smoker | 35 608.9 | 38 | 106.7 (72.8–140.7) | 1.00 | 1.00 |  |
 Ex/current smoker | 9006.3 | 24 | 266.5 (159.9–373.1) | 2.27 (1.36–3.78)** | 2.12 (1.27–3.54) | 0.004 |
alcohol drinker | ||||||
 Non-drinker | 35 752.6 | 48 | 134.3 (96.3–172.2) | 1.00 |  |  |
 Ex/current drinker | 8827.0 | 14 | 158.6 (75.5–241.7) | 1.06(0.58–1.92) |  |  |
BMI level | ||||||
 18.5–23.9 | 27 380.2 | 39 | 142.4 (97.7–187.1) | 1.00 | 1.00 |  |
  < 18.5 | 4789.2 | 17 | 355.0 (186.2–523.7) | 2.37 (1.34–4.19)** | 2.33 (1.32–4.12) | 0.004 |
  ≥ 24 | 12 445.2 | 6 | 48.2 (17.7–104.9) | 0.33 (0.14–0.77)** | 0.34 (0.14–0.80) | 0.014 |