Table 1

Data and calculations

time period 0

time period 1

yearly change in incident breast cancer deaths per 100,000


county

number eligible

incident breast cancer deaths

fraction screened

number eligible

incident breast cancer deaths

fraction screened

estimate

standard error


Varmland

39946

36

.03

40853

37

.73

.16

7.55

Sodermanland

49526

98

.007

53760

79

.77

-7.89

4.28

Uppsala

43340

110

.03

52426

112

.82

-5.73

4.43

Vastamanland

49827

112

.14

52329

85

.92

-8.88

3.93

Orebro

52936

133

.04

54366

108

.64

-9.74

5.36

Gavleborg

56794

311

.00

56145

219

.84

-13.40

3.64


Fraction screened is from Table 1 of [5]. Incident breast cancer deaths are from Table 3 of [5]. Number eligible is person years from Table 3 of [5] divided by years in time period from Table 2 of [5]. Calculations assume k = 0 for sensitivity analysis. Above yields Q = 3.72, σ2 = 0, and overall estimate of -9 with 95% confidence (-14, -4) per 100,000.

Baker et al. BMC Medical Research Methodology 2004 4:12   doi:10.1186/1471-2288-4-12

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