Table 1 Characteristics of the study participants
Variables | Total (N = 600) n* (%) | PTB patients (N = 200) n* (%) | LTBI controls (N = 200) n* (%) | Healthy controls without MTB infection (N = 200) n* (%) | p for difference |
|---|---|---|---|---|---|
Age | |||||
18–19 years | 48 (8.0) | 16 (8.0) | 15 (7.5) | 17 (8.5) | |
20–24 years | 183 (30.5) | 61 (30.5) | 62 (31.0) | 60 (30.0) | |
25–29 years | 68 (11.3) | 23 (11.5) | 23 (11.5) | 22 (11.0) | |
30–34 years | 50 (8.3) | 16 (8.0) | 16 (8.0) | 18 (9.0) | |
35–39 years | 60 (10.0) | 20 (10.0) | 20 (10.0) | 20 (10.0) | |
40–44 years | 48 (8.0) | 16 (8.0) | 16 (8.0) | 16 (8.0) | |
45–49 years | 65 (10.8) | 22 (11.0) | 22 (11.0) | 21 (10.5) | |
≥50 years | 78 (13.0) | 26 (13.0) | 26 (13.0) | 26 (13.0) | |
Gender | |||||
Male | 333 (55.5) | 111 (55.5) | 111 (55.5) | 111 (55.5) | |
Female | 267 (44.5) | 89 (44.5) | 89 (44.5) | 89 (44.5) | |
Education | |||||
≤9 years | 109 (18.2) | 71 (35.5) | 16 (8.0) | 22 (11.0) | <0.01§ |
10–12 years | 139 (23.2) | 55 (27.5) | 31 (15.5) | 53 (26.5) | <0.01& |
>12 years | 352 (58.7) | 74 (37.0) | 153 (76.5) | 125 (62.5) | |
Per capita income in the family | |||||
<500 Yuan/Month | 109 (18.2) | 59 (29.5) | 24 (12.0) | 26 (13.0) | <0.01§ |
500-2000 Yuan/Month | 254 (42.3) | 73 (36.5) | 96 (48.0) | 85 (42.5) | <0.01& |
≥2000 Yuan/Month | 237 (39.5) | 68 (34.0) | 80 (40.0) | 89 (44.5) | |
Smoke status | |||||
Never smoker | 429 (71.5) | 131 (65.5) | 146 (73.0) | 152 (76.0) | 0.10§ |
Former smoker | 72 (12.0) | 38 (19.0) | 23 (11.5) | 11 (5.5) | <0.01& |
Current smoker | 99 (16.4) | 31 (15.5) | 31 (15.5) | 37 (18.5) | |
Current alcohol drinking | |||||
No | 236 (39.4) | 79 (39.5) | 86 (43.2) | 71 (35.5) | 0.45§ |
Yes | 363 (60.0) | 121 (60.5) | 113 (56.8) | 129 (64.5) | 0.41& |
BMI | |||||
≤18.5 (underweight) | 78 (12.2) | 42 (21.0) | 17 (8.5) | 14 (7.0) | <0.01§ |
18.5-25 (normal) | 412 (68.7) | 146 (73.0) | 128 (64.0) | 138 (69.0) | <0.01& |
>25 (overweight) | 115 (19.2) | 12 (6.0) | 55 (27.5) | 48 (24.0) | |
Is there TB patient in the family | |||||
No | 550 (91.8) | 179 (89.9) | 185 (92.5) | 186 (93.0) | 0.37§ |
Yes | 49 (8.2) | 20 (10.1) | 15 (7.5) | 14 (7.0) | 0.28& |
Number of scars by BCG vaccination | |||||
0 | 242 (40.3) | 131 (65.5) | 66 (33.0) | 45 (22.5) | <0.01§ |
1 | 309 (51.5) | 60 (30.0) | 117 (58.5) | 132 (66.0) | <0.01& |
≥2 | 49 (8.2) | 9 (4.5) | 17 (8.5) | 23 (11.5) | |