Google

Yahoo

Bing

PubMed

WebMD

anesthesia

38,200,000

31,700,000

33,300,000

254854

907

surgery

99,800,000

332,000,000

316,000,000

3109086

8520

surgery/anesthesia

2.6

10.5

9.5

12.2

9.4

pain

168,000,000

772,000,000

759000000

483137

10000

pain/anesthesia

4.4

24.4

22.8

1.9

11.0

anesthesiologist

1,290,000

5980000

6150000

3379

135

surgeon

114,000,000

132,000,000

133000000

54132

2718

surgeon/anesthesiologist

88.4

22.1

21.6

16.0

20.1

preoperative

8060000

3,460,000

3410000

165311

170

postoperative

36,400,000

6,700,000

6,630,000

515253

353

postoperative/preoperative

4.5

1.9

1.9

3.1

2.1

before (and) anesthesia

25200000

20,800,000

21,700,000

254854

530

before anesthesia/preoperative

3.1

6.0

6.4

1.5

3.1

Data accessed from January 4th, 2012
Table 2: Approximate number of “hits” or web resources available as of January 4, 2012 for anesthesiology and perioperative keyword terms into common search engines.