Table 3 Multivariate logistic analysis of the probability of receiving a mastectomy by year of diagnosis, age, tumour size and detection methoda

From: Mastectomy rates are decreasing in the era of service screening: a population-based study in Italy (1997–2001)

 

OR b

95% CI

P -value

Year of diagnosis c

 Common OR for a unit increase

0.90

0.88–0.93

<0.001

Age (years)

 40–49d

1.00

—

—

 50–59

1.15

1.02–1.29

0.018

 60–69

1.31

1.16–1.47

<0.001

 70–79

2.15

1.93–2.39

<0.001

pT

 PTis

0.60

0.53–0.68

<0.001

 pT1micr

1.90

1.54–2.35

<0.001

 pT1a

0.76

0.64–0.91

0.002

 pT1b

0.52

0.47–0.58

<0.001

 pT1cd

1.00

—

—

 pT1NOS

0.95

0.66–1.38

0.79

 pT2 ⩽30 mm

2.83

2.61–3.09

<0.001

Method of detection

 NSD not yet invitedd

1.00

—

—

 SD at first test

0.65

0.58–0.72

<0.001

 SD at subsequent tests

0.53

0.45–0.62

<0.001

 NSD with a previous test

0.88

0.76–1.02

0.09

 NSD never respondend

1.19

1.05–1.35

0.007

Log likelihood

−10 176.3, P<0.0001

  
  1. CI=confidence interval; NSD=not screen-detected; OR=odds ratio; SD=screen-detected.
  2. OR and 95% CI.
  3. aExcluded cases with unknown treatment or not operated and cases with pTX or pTunknown or pT>30 mm.
  4. bAdjusted by multivariate regression for each of the variables in the table.
  5. cLinear assumption.
  6. Reference.
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