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Table 1 Health Service Area (HSA) characteristics, 1997–2002

From: Incorporating health care quality into health antitrust law

HSA

Mean hospitals per year

Minimum hospitals per year

Maximum hospitals per year

Mean market HHI (st. deviation)

Mean CABG HHI (st. deviation)

Mean CABG volume (st. deviation)

Mean HMO penetration (st. deviation)

1

1.83

1

2

0.0507 (0.00489)

0.645 (0.134)

387.91 (217.86)

0.129 (0.0330)

2

3.17

2

4

0.084 (0.00128)

0.545 (0.0907)

410.53 (381.62)

0.705 (0.0116)

3

1.67

1

2

0.114 (0.00843)

0.610 (0.206)

203.6 (47.77)

0.592 (0.0490)

4

6.83

5

8

0.0888 (0.00519)

0.278 (0.0652)

273.98 (279.93)

0.558 (0.0473)

5

4.67

4

6

0.0704 (0.00612)

0.316 (0.0752)

187.61 (169.61)

0.649 (0.0185)

6

3.17

3

4

0.0777 (0.00458)

0.379 (0.0509)

278.52 (130.44)

0.530 (0.0537)

7

1.67

1

3

0.124 (0.0258)

0.675 (0.252)

134.4 (95.08)

0.591 (0.0205)

8

1.83

1

2

0.123 (0.0157)

0.601 (0.136)

197.36 (89.0)

0.271 (0.0127)

9

1.0

1

1

0.0643 (0.0107)

1 (0)

340.33 (52.92)

0.230 (0.0759)

10

2.0

1

3

0.0855 (0.00475)

0.536 (0.227)

196.83 (77.93)

0.419 (0.0211)

11

19.17

17

25

0.0155 (0.00107)

0.095 (0.0305)

208.06 (206.86)

0.485 (0.0403)

12

2.0

1

3

0.0498 (0.00273)

0.386 (0.0797)

282.33 (178.66)

0.540 (0.0328)

13

5.83

1

9

0.0434 (0.00655)

0.187 (0.144)

204.37 (67.38)

0.532 (0.0532)

14

6.33

4

8

0.0551 (0.00179)

0.178 (0.0413)

277.68 (84.74)

0.514 (0.0309)