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| Age (years) | Cases (n) | Positive cases (n) | Positive rate (%) | χ2 | P value |
|---|---|---|---|---|---|
| 0–1 | 7,513 | 447 | 5.95 | ||
| 1–3 | 15,608 | 3,394 | 21.75 | ||
| 3–6 | 23,038 | 6,855 | 29.76 | ||
| 6–12 | 7,114 | 3,679 | 51.71 | ||
| Total | 53,273 | 14,375 | 26.98 | 4,203.000 | 0.000 |
Mp, Mycoplasma pneumoniae.
