Table 1 General information on infants testing positive for respiratory pathogens before, during, and after NPI implementation
|  | Before NPI implementation (160) | During NPI implementation (235) | After NPI release (218) | χ2 | P Value |
|---|---|---|---|---|---|
Gender | Â | Â | Â | 1.298 | 0.523 |
 Male | 93 (58.1) | 136 (57.9) | 116 (53.2) |  |  |
 Female | 67 (41.9) | 99 (42.1) | 102 (46.8) |  |  |
Age | |||||
 ≤ 28d | 93 (58.1) | 91 (38.7) | 68 (31.2)a | 28.543 | 0.000 |
 29 ~ 60d | 55 (34.4) | 124 (52.8)a | 107 (49.1)a | 13.737 | 0.001 |
 > 60d | 12 (7.5) | 20 (8.5) | 43 (19.7)ab | 17.765 | 0.000 |
Full-term or premature infants | Â | Â | Â | 5.509 | 0.064 |
Term Infant | 153 (95.6) | 212 (90.2) | 194 (89.0) | Â | Â |
Premature | 7 (4.4) | 23 (9.8) | 24 (11.0) | Â | Â |
Respiratory patient contact history | 78 (48.8) | 114 (48.5) | 150 (68.8)ab | 23.241 | 0.000 |
Pre-admission course | 3 (2, 5) | 4 (2, 6) | 3 (1, 5)b | H = 6.659 | 0.036 |
Hospitalization days | 6 (4, 7) | 7 (5, 9)a | 6 (5, 8)a | H = 13.328 | 0.001 |
Mechanical ventilation use | 15 (9.4) | 27(11.5) | 14 (6.4) | 3.513 | 0.173 |