Table 4 The results of LTBI and strong positive for PPD of freshmen between 17–20
From: Tuberculosis screening characteristics amongst freshmen in Changping District, Beijing, China
Age | Freshmen | ||||||
|---|---|---|---|---|---|---|---|
Total N | LTBI N (%) | Chi-squared test for trend | Strong positive for PPD N (%) | Chi-squared test for trend | |||
χ2 | p | χ2 | p | ||||
17 | 4412 | 453(10.5) | 16.142 |  < 0.001 | 189(4.3) | 34.559 |  < 0.001 |
18 | 6670 | 774(11.6) | 340(5.1) | ||||
19 | 5214 | 631(12.1) | 297(5.7) | ||||
20 | 2114 | 285(13.5) | 150(7.1) | ||||