Comparison of Mycoplasma-positive and Mycoplasma-negative subjects
| Mycoplasma-positive | Mycoplasma-negative | P value | |
| Count | 10 | 211 | n/a |
| Age (years) | 0.02 | ||
| Mean (SD) | 8.1 (6.1) | 4.6 (4.4) | |
| Median (IQR) | 7.2 (2.0–16) | 3.0 (1.3–6.0) | |
| % greater than 5 years | 60% | 34% | |
| With viral infection or asthma diagnosis, n (%) | 3 (30) | 110 (51) | 0.2 |
| (restricted to subjects >5 years) | 0 | 30 (42) | 0.08 |
| With no detectable respiratory virus in NPS, n (%) | 7 (70) | 65 (31) | 0.02 |
| (restricted to subjects >5 years) | 5 (83) | 33 (46) | 0.1 |
| Median duration of antibiotic treatment (days) (IQR) | 11 (7–17) | 5 (0–8) | 0.02 |
| (restricted to subjects with uncomplicated pneumonia) | 12 (10–13) | 7 (7–10) | 0.004 |
| Median length of stay in PICU (days) (IQR) | 4.5 (2–8) | 3 (2–5) | 0.1 |
| (restricted to subjects with uncomplicated pneumonia) | 7 (2–8) | 4 (2–7) | 0.7 |
| Median length of stay in the hospital (days) (IQR) | 10 (5–13) | 4 (3–8) | 0.03 |
| (restricted to subjects with uncomplicated pneumonia) | 13 (7–14) | 7 (3–14) | 0.3 |
NPS, nasopharyngeal swab; PICU, paediatric intensive care unit.