Table 4 Change in administration of pharmacologic prophylaxis by hospital and service across the three study time periods

Hospital A

Medicine

6,753 (44.1%)

10,977 (47.7%)

6,662 (56.0%)

<0.01

Ortho/Trauma

1,121 (54.5%)

2,207 (63.9%)

1,301 (69.9%)

<0.01

Other Surgery

6,623 (38.0%)

11,638 (46.0%)

6,162 (53.0%)

<0.01

All

14,497 (41.7%)

24,822 (48.0%)

14,125 (55.7%)

<0.01

Hospital B

Medicine

4,455 (45.9%)

7,136 (49.0%)

3,792 (55.1%)

<0.01

Ortho/Trauma

710 (35.5%)

1,355 (43.9%)

730 (45.5%)

<0.01

Other Surgery

911 (48.0%)

1,563 (56.5%)

800 (60.8%)

<0.01

All

6,076 (44.6%)

10,054 (49.3%)

5,322 (54.3%)

<0.01

Hospital C

Medicine

4,330 (57.9%)

6,067 (58.2%)

3,538 (63.2%)

<0.01

Ortho/Trauma

2,103 (58.4%)

2,902 (58.4%)

1,463 (62.0%)

<0.01

Other Surgery

2,498 (23.1%)

4,862 (32.7%)

2,968 (41.0%)

<0.01

All

8,931 (40.8%)

13,831 (45.7%)

7,969 (52.5%)

<0.01

Overall

Medicine

15,538 (47.8%)

24,180 (50.4%)

13,992 (57.4%)

<0.01

Ortho/Trauma

3,934 (51.4%)

6,464 (56.2%)

3,494 (60.0%)

<0.01

Other Surgery

10,032 (33.3%)

18,063 (42.1%)

9,930 (49.2%)

<0.01

All

29,504 (42.0%)

48,707 (47.6%)

27,416 (54.4%)

<0.01