Table 1. Patients with healthcare-associated MRSA isolates, 1999–2004, and predictors of SCCmec type IV phenotype*.
| Characteristic | Patients with HA-MRSA Isolates, % (no.) | SCCmec phenotype,% (no.) |
Predictors of SCCmec type IV phenotype |
||||
|---|---|---|---|---|---|---|---|
| Bivariate anaylsis |
Multivariate analysis |
||||||
| Type IV | Type II/III | Odds ratio (95% CI) | p value | Odds ratio (95% CI) | p value | ||
| Total |
(352) |
36 (128) |
64 (224) |
|
|
|
|
| Sex | |||||||
| F |
35 (123) |
36 (44) |
64 (79) |
|
0.87 |
>0.05 |
|
| M |
65 (229) |
37 (84) |
63 (145) |
|
|
||
| Age, y | |||||||
| Mean |
50 ± 19 SD |
47±1.7 SE |
51±1.3 SE |
0.02
|
>0.05 |
||
| Median (range) |
50 (<1–97) |
48 (<1–87) |
54 (<1–97) |
|
|
|
|
| Time from admission to specimen collection, d | |||||||
| Mean |
19 ± 21 SD |
15±1.9 SE |
21±1.4 SE |
0.01
|
0.88 (0.8–0.98)† |
0.02
|
|
| Median (range) |
12 (4–184) |
8 (4–174) |
15 (4–184) |
|
|
|
|
| Culture specimen source | |||||||
| Blood |
10 (35) |
46 (16) |
54 (19) |
2.6 (1.2–5.7) |
0.02
|
2.2 (0.97–5.0) | 0.058 |
| Sputum |
34 (188) |
25 (29) |
75 (89) |
Reference |
|
Reference |
|
| Wound |
38 (133) |
49 (65) |
51 (68) |
2.9 (1.7–5.0) |
<0.0001
|
2.6 (1.5–4.6) |
0.001
|
| Other |
19 (66) |
27 (18) |
73 (48) |
1.2 (0.6–2.3) |
0.69 |
1.1 (0.5–2.2) |
0.82 |
| Year culture specimen collected | |||||||
| 1999 |
52 (15) |
17 (9) |
83 (43) |
Reference |
<0.0001‡
|
Reference |
<0.0001 |
| 2000 |
57 (16) |
19 (11) |
81 (46) |
1.1 (0.4–3.0) |
|
NS§ |
|
| 2001 |
65 (19) |
28 (18) |
72 (47) |
1.8 (0.7–4.5) |
1.8 (0.9–3.7) |
||
| 2002 |
47 (13) |
43 (20) |
57 (27) |
3.5 (1.4–8.9] |
3.2 (1.5–6.9) |
||
| 2003 |
63 (18) |
56 (35) |
44 (28) |
6.0 (2.4–14.3) |
5.2 (2.5–10.5) |
||
| 2004 | 68 (19) | 52 (35) | 48(33) | 5.1 (2.1–12) | 4.4 (2.2–8.8) | ||
*MRSA, methicillin-resistant Staphylococcus aureus; HA, healthcare associated; CI, confidence interval; SD, standard deviation; SE, standard error; NS, not significant; boldface indicates significance. †Multivariate analysis results reflect time in weeks. ‡Measured with the Cochran-Armitage test of trends. §Was not a significant predictor in the multivariate model.