Table 1.
Characteristics of infants with Staphylococcus aureus infection during the two study periods
| |
Period A (n = 41) |
Period B (n = 115) |
||
|---|---|---|---|---|
| Characteristics | MSSA (n = 31) | MRSA (n = 10) | MSSA (n = 51) | MRSA (n = 64) |
| Birth weight (g) |
|
|
|
|
| Median (25th-75th percentile) |
752 (553-977) |
737 (563-1120) |
838 (647-1081) |
736 (580-945) |
| Category, n (%) |
|
|
|
|
| <750 |
16 (52) |
4 (40) |
21 (42) |
37 (58) |
| 751 – 1000 |
7 (23) |
0 (0) |
14 (28) |
17 (26) |
| 1001 – 1250 |
2 (6) |
2 (20) |
8 (16) |
4 (6) |
| 1251 – 1500 |
2 (6) |
2 (20) |
2 (4) |
1 (2) |
| >1500 |
4 (13) |
2 (20) |
5 (10) |
5 (8) |
| Gestational age (weeks) |
|
|
|
|
| Median (25th-75th percentile) |
27 (25-29) |
27 (24-31) |
27 (26-30) |
27 (25-29) |
| Category, n (%) |
|
|
|
|
| 23-25 |
9 (29) |
3 (30) |
9 (18) |
20 (31) |
| 26-28 |
12 (39) |
3 (30) |
25 (48) |
23 (36) |
| 29-31 |
6 (19) |
2 (20) |
11 (22) |
13 (20) |
| ≥32 |
4 (13) |
2 (20) |
6 (12) |
8 (13) |
| Gender |
|
|
|
|
| Male (%) |
12 (39) |
5 (50) |
26 (51) |
32 (50) |
| Female (%) |
17 (61) |
5 (50) |
25 (49) |
32 (50) |
| Frequency of invasive procedures |
|
|
|
|
| n (%) |
27 (87) |
9 (90) |
46 (90) |
55 (86) |
| Mechanical ventilation |
|
|
|
|
| n (%) |
29 (94) |
9 (90) |
47 (92) |
60 (94) |
| Age at diagnosis (days) |
|
|
|
|
| Median | 27 | 25 | 22 | 25 |