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Table 1 Pathological prognostic factors and clinical stage at presentation for women with breast cancer living in affluent and deprived areas (whole sample and questionnaire respondents)

From: The impact of consent on observational research: a comparison of outcomes from consenters and non consenters to an observational study

 

AFFLUENT n (%)

DEPRIVED n (%)

Chi squared test result

PATHOLOGICAL PROGNOSTIC FACTORS

SIZE*

WHOLE SAMPLE

n = 136

CONSENTED SAMPLE

n = 72

WHOLE SAMPLE

n = 194

CONSENTED SAMPLE

n = 91

WHOLE SAMPLE

CONSENTED SAMPLE

0 – 19 mm

70 (51.5%)

42 (58.3%)

106 (54.6%)

54 (59.3%)

X 2 = 0.53

X 2 = 0.04

20 – 49 mm

62 (45.6%)

29 (40.3%)

81 (41.8%)

36 (39.6%)

DF = 2

DF = 2

>50 mm

4 (2.9%)

1 (1.4%)

7 (3.6%)

1 (1.1%)

p = 0.76

p = 0.98

GRADE*

n = 110

n = 59

n = 156

n = 72

  

1

17 (15.5%)

9 (15.3%)

30 (19.2%)

18 (25.0%)

X 2 = 0.66

X 2 = 1.83

2

67 (60.9%)

39 (66.1%)

92 (59.0%)

42 (58.3%)

DF = 2

DF = 2

3

26 (23.6%)

11 (18.6%)

34 (21.8%)

12 (16.7%)

p = 0.72

p = 0.34

NODAL STATUS*

n = 128

n = 72

n = 196

n = 93

  

Positive

48 (37.5%)

24 (33.3%)

72 (36.7%)

28 (30.1%)

X 2 = 0.01

X 2 = 0.196

Negative

80 (62.5%)

48 (66.6%)

124 (63.3%)

65 (69.9%)

DF = 1

p = 0.88

DF = 2

p = 0.736

CLINICAL STAGE AT PRESENTATION

 

n = 156

 

n = 260

   

Early

146 (93.6%)

100%

220 (84.6%)

100%

X 2 = 7.42

N/A

Locally advanced or metastatic

10 (6.4%)

 

40 (15.4%)

 

DF = 1

p = 0.006

 
  1. * Size, grade and nodal status only potentially available for the 366 women (146 affluent and 220 deprived) who had operable breast cancer.
  2. *Total n for whole sample < 366 due to missing data
  3. **Total n for consented sample < 177 due to missing data
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BMC Medical Research Methodology

ISSN: 1471-2288

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