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Clinical characteristics of the Beijing and non-Beijing family strains
| Characteristics | Total | Beijing family | Non-Beijing family | χ2 | P-value |
|---|---|---|---|---|---|
| Age, years | |||||
| ≤30 | 153 | 150 | 3 | 784.00 | < 0.05 |
| 30–60 | 306 | 279 | 27 | ||
| ≥60 | 44 | 41 | 3 | ||
| Gender | |||||
| Male | 314 | 289 | 25 | 2.68 | > 0.05 |
| Female | 189 | 181 | 8 | ||
| Treatment history | |||||
| New cases | 201 | 168 | 33 | 214.40 | < 0.05 |
| Retreatment | 302 | 302 | 0 | ||
| Regions | |||||
| Chongqing | 413 | 402 | 11 | 25.40 | < 0.05 |
| Sichuan Province | 81 | 78 | 3 | ||
| Other regions | 9 | 6 | 3 | ||
