Table 3 Incidence rates and relative risk for active TB among elderlies 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 | 215 | 481.8 (417.4–546.2) |  |  |  |
Gender | ||||||
 Female | 23 959.1 | 76 | 317.2 (245.9–388.5) | 1.00 | 1.00 |  |
 Male | 20 663.1 | 139 | 672.7 (560.9–784.5) | 2.11 (1.59–2.80)*** | 1.78 (1.27–2.50) | 0.001 |
Age group | ||||||
 65–74 | 28 910.3 | 121 | 418.5 (344.0–493.1) | 1.00 | 1.00 |  |
  ≥ 75 | 15 711.9 | 94 | 598.3 (477.3–719.2) | 1.42 (1.08–1.87)* | 1.33 (1.00–1.80) | 0.053 |
Nationality | ||||||
 Han | 38 909.5 | 157 | 403.5 (340.4–466.6) | 1.00 | 1.00 |  |
 Others | 5703.3 | 58 | 1017.0 (755.2–1278.7) | 5.29 (3.77–7.41)*** | 5.15 (3.52–7.54) | < 0.001 |
Education | ||||||
 High school and above | 3536.9 | 12 | 339.3 (147.3–531.3) | 1.00 |  |  |
 Primary to secondary | 23 111.4 | 108 | 467.3 (379.2–555.4) | 1.00 (0.55–1.82) |  |  |
 Illiteracy | 16 550.9 | 95 | 574.0 (458.6–689.4) | 1.36 (0.74–2.49) |  |  |
Marital status | ||||||
 Married | 32 515.4 | 168 | 516.7 (438.6–594.8) | 1.00 |  |  |
 Others$ | 121 01.9 | 47 | 388.4 (277.3–499.4) | 0.82 (0.59–1.13) |  |  |
Residence | ||||||
 Local residents | 42 495.9 | 207 | 487.1 (420.8–553.5) | 1.00 |  |  |
 Others | 2126.3 | 8 | 376.2 (162.3–741.2) | 1.44 (0.71–2.92) |  |  |
Annual average income per person in the family (RMB) | ||||||
 ≥10 000 | 19 617.4 | 63 | 321.1 (241.8–400.5) | 1.00 | 1.00 |  |
 2300–9999 | 17 234.1 | 93 | 539.6 (430.0–649.3) | 1.53 (1.11–2.11)*** | 1.32 (0.95–1.83) | 0.095 |
  < 2300 | 5708.9 | 41 | 718.2 (498.4–938.0) | 2.29 (1.54–3.40)*** | 1.48 (0.97–2.26) | 0.072 |
Diabetes | ||||||
 No | 41 653.3 | 206 | 494.6 (427.0–562.1) | 1.00 |  |  |
 Yes | 2968.9 | 9 | 303.1 (138.8–575.3) | 0.62 (0.32–1.21) |  |  |
Previously treated with TB | ||||||
 No | 43 871.8 | 201 | 458.2 (394.8–521.5) | 1.00 | 1.00 |  |
 Yes | 750.4 | 14 | 1865.7 (888.4–2843.0) | 3.70 (2.15–6.37)*** | 3.18 (1.83–5.52) | < 0.001 |
Chronic bronchitis | ||||||
 No | 42 311.8 | 199 | 470.3 (405.0–535.7) | 1.00 |  |  |
 Yes | 2188.2 | 16 | 731.2 (372.9–1089.5) | 1.55(0.93–2.59) |  |  |
Pneumoconiosis | ||||||
 No | 44 500.5 | 213 | 478.7 (414.4–542.9) | 1.00 |  |  |
 Yes | 112.6 | 2 | 1755.6 (214.8–6409.8) | 3.65 (0.91–14.71) |  |  |
cigarette smoker | ||||||
 Non-smoker | 35 608.9 | 146 | 410.0 (343.5–476.5) | 1.00 | 1.00 |  |
 Ex/current smoker | 9006.3 | 69 | 766.1 (585.4–946.9) | 1.77 (1.33–2.37)*** | 1.48 (1.06–2.09) | 0.023 |
alcohol drinker | ||||||
 Non-drinker | 35 752.6 | 156 | 436.3 (367.9–504.8) | 1.00 | 1.00 |  |
 Ex/current drinker | 8827.0 | 59 | 668.4 (497.9–839.0) | 1.37 (1.01–1.85)* | 0.941 (0.66–1.34) | 0.732 |
BMI level | ||||||
 18.5–23.9 | 27 380.2 | 147 | 536.9 (450.1–623.7) | 1.00 | 1.00 |  |
  < 18.5 | 4789.2 | 37 | 772.6 (523.6–1021.5) | 1.39 (0.97–2.00) | 1.29 (0.88–1.88) | 0.194 |
  ≥ 24 | 12 445.2 | 31 | 249.1 (161.4–336.8) | 0.46 (0.31–0.67)*** | 0.53 (0.35–0.79) | 0.002 |