BCSC
Breast Cancer Surveillance Consortium: Working together to advance breast cancer research
 
Home   |   Data   |   Statistics   |   Tools   |   Collaborations   |   Work with Us   |   Publications   |   About   |   Links

Distribution of Key Variables

Women

  Exam year
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
  4.7 6.2 7.7 7.9 8.1 8.2 8.7 8.3 8.3 7.0 6.2 6.2 6.2 6.2

Unique women per year, Row percents
One site contributes either no data or incomplete data for years 2004+.

[Index of Tables]


Breast cancers

  Diagnosis year
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
  6.0 6.4 7.2 7.7 7.7 8.0 7.9 7.8 7.4 7.3 7.1 6.6 6.7 6.2

Unique diagnoses (at most 1 cancer per woman), Row percents
One site contributes either no cancer data or incomplete cancer data for years 2006+.
Another site contributes incomplete cancer data for 2009.

[Index of Tables]


Exams

  Exam year
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
  4.5 6.0 7.6 7.9 8.1 8.3 8.8 8.4 8.4 7.0 6.2 6.2 6.2 6.3

All exams by year, Row percents
One site contributes either no data or incomplete data for years 2004+.

[Index of Tables]


Indication for exam

  Exam year
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
1: Routine screening 84.2 83.5 81.8 80.1 79.4 78.3 79.0 78.9 79.6 80.3 81.2 80.0 80.0 79.8
2: Additional evaluation 6.0 5.8 6.2 6.9 7.3 8.6 8.2 8.1 7.5 7.4 7.6 8.4 8.7 8.5
3: Short interval follow-up 2.0 2.7 3.2 3.5 3.7 3.7 3.5 3.3 3.2 3.1 3.0 2.9 2.8 2.8
4: Evaluation 7.8 7.8 8.5 9.2 9.2 9.1 8.9 9.1 9.3 8.8 7.7 8.1 7.9 8.3
5: Other 0.0 0.2 0.3 0.3 0.4 0.3 0.5 0.5 0.4 0.3 0.5 0.5 0.7 0.7

All exams by year, Column percents among non-missing values -- see Ns for rates of missing
One site contributes either no data or incomplete data for years 2004+.

[Index of Tables]


Symptoms (self-reported)

  Exam year
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
0: No symptoms 86.3 88.2 88.6 88.1 88.4 88.4 89.1 89.1 90.0 90.2 91.5 91.6 92.0 92.3
1: Pain 1.3 0.9 0.5 0.7 1.2 2.1 2.4 2.3 2.3 2.4 2.3 2.2 2.0 2.0
2: Other 3.7 3.4 3.4 3.3 2.9 2.4 2.1 2.2 2.2 2.3 1.9 1.8 1.7 1.7
3: Nipple discharge 0.7 0.6 0.5 0.5 0.5 0.5 0.6 0.5 0.5 0.5 0.4 0.4 0.4 0.4
4: Lump 6.7 5.8 5.8 6.4 6.3 6.4 5.8 5.8 4.9 4.5 3.8 3.8 3.8 3.5
5: Symptoms, not otherwise specified 1.4 1.1 1.2 1.0 0.8 0.2 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1

All exams by year, Column percents among non-missing values -- see Ns for rates of missing
One site contributes either no data or incomplete data for years 2004+.

[Index of Tables]


Time since last mammogram

  Exam year
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
0: No previous mammogram 8.0 7.2 7.2 6.6 5.8 5.3 4.4 4.0 3.7 3.8 3.9 3.7 3.5 3.1
1: Within a year (0-11 months) 15.3 16.1 18.3 19.2 19.0 19.0 19.1 18.6 18.6 18.0 17.7 17.9 17.5 17.8
2: 1-2 years (12-35 months) 65.2 65.4 64.0 65.6 67.3 67.8 68.3 69.6 69.2 69.2 69.8 70.1 70.8 71.0
3: 3-4 years (36-59 months) 7.6 7.1 6.6 5.4 5.0 5.2 5.5 5.2 5.5 5.8 5.6 5.2 5.0 4.8
4: Five years or more (60+ months) 3.9 4.2 4.0 3.3 2.9 2.8 2.8 2.7 3.1 3.1 3.1 3.2 3.2 3.2

All exams by year, Column percents among non-missing values -- see Ns for rates of missing
One site contributes either no data or incomplete data for years 2004+.

[Index of Tables]


Time since last clinical breast exam

  Exam year
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
0: None within the last 3 months / No other information 0.1 0.7 1.2 6.3 12.8 30.6 30.3 31.7 33.6 34.6 37.9 40.9 42.9 43.3
1: Within the last 3 months 23.5 11.6 2.9 7.8 14.3 46.4 49.2 47.9 48.6 47.0 45.3 43.7 43.0 42.1
2: 4 months to 1 year ago 10.9 5.2 0.8 0.7 . 6.9 10.7 10.5 8.8 8.7 7.2 6.6 6.0 6.3
3: More than 1 year ago 21.9 21.6 20.4 17.3 14.7 8.0 9.4 9.6 8.8 9.3 9.2 8.5 7.9 8.1
4: Never had a clinical breast exam 3.5 1.7 0.5 0.3 0.2 0.2 0.3 0.3 0.3 0.3 0.3 0.3 0.2 0.3
5: Within the last year 40.1 59.2 74.2 67.6 58.0 7.8 0.1 0.0 . 0.0 . 0.0 0.0 .

All exams by year, Column percents among non-missing values -- see Ns for rates of missing
One site contributes either no data or incomplete data for years 2004+.

[Index of Tables]


Any mammogram performed

  Exam year
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
0: No 3.3 2.8 4.2 5.7 6.1 6.6 6.8 6.7 7.0 5.2 3.7 3.8 3.8 3.7
1: Yes 96.7 97.2 95.8 94.3 93.9 93.4 93.2 93.3 93.0 94.8 96.3 96.2 96.2 96.3

All exams by year, Column percents among non-missing values -- see Ns for rates of missing
One site contributes either no data or incomplete data for years 2004+.

[Index of Tables]


Digital mammograms

  Exam year
2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
1: Right breast only 16.7 6.7 5.8 5.5 5.9 5.3 4.6 4.9 5.1 5.1
2: Left breast only 16.7 6.7 6.3 5.3 5.8 5.3 4.6 5.1 5.4 5.3
3: Unilateral, side not specified . 1.3 0.5 0.2 0.2 0.2 0.1 0.1 0.1 0.1
4: Bilateral (both breasts) 50.0 84.8 87.1 88.7 88.1 80.2 61.5 67.9 78.6 80.1
5: Yes, woman-level information only 16.7 0.6 0.3 0.2 0.1 9.0 29.2 22.0 10.8 9.4

All exams by year, Column percents among non-missing values -- see Ns for rates of missing
One site contributes either no data or incomplete data for years 2004+.

[Index of Tables]


Ultrasounds

  Exam year
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
1: Right breast only 15.3 20.9 18.8 19.7 16.4 18.6 22.7 22.4 22.2 27.5 28.7 27.4 26.6 25.7
2: Left breast only 17.4 23.7 21.2 22.0 18.1 21.5 25.1 24.3 25.2 30.6 31.9 30.0 29.7 28.4
3: Unilateral, side not specified . . . . 1.0 4.0 12.5 13.5 12.8 11.3 . . . .
4: Bilateral (both breasts) 33.7 18.6 18.0 22.5 26.1 12.4 7.9 7.5 10.6 13.9 15.3 13.5 12.7 18.0
5: Yes, woman-level information only 33.5 36.8 42.0 35.9 38.3 43.5 31.8 32.4 29.2 16.7 24.1 29.1 31.0 28.0

All exams by year, Column percents among non-missing values -- see Ns for rates of missing
One site contributes either no data or incomplete data for years 2004+.

[Index of Tables]


BI-RADS Breast density

  Exam year
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
1: Almost entirely fat 10.4 9.2 8.2 7.5 7.2 7.4 6.9 7.5 7.8 8.0 8.0 8.7 9.7 10.1
2: Scattered fibroglandular tissue 45.6 44.7 44.9 44.7 42.9 42.9 43.8 45.4 46.6 46.2 43.8 42.5 43.1 42.7
3: Heterogeneously dense 34.4 37.0 38.3 40.0 41.6 41.6 41.5 39.6 38.3 38.5 40.3 40.9 39.3 38.7
4: Extremely dense 9.5 9.1 8.6 7.9 8.2 8.0 7.7 7.6 7.3 7.3 7.8 7.9 7.9 8.5

Exams by year, Column percents among non-missing values -- see Ns for rates of missing
Only includes breast density measured using the BI-RADS system.
One site contributes either no data or incomplete data for years 2004+.

[Index of Tables]


Radiologists

  Exam year
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
  6.3 8.3 8.9 9.4 8.6 7.7 7.8 7.7 7.4 6.7 5.8 5.2 5.3 4.8

Unique radiologists per year, Row percents
One site contributes either no data or incomplete data for years 2004+.

[Index of Tables]


Facilities where mammograms were taken

  Exam year
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
  9.9 10.5 9.2 8.1 7.6 7.3 7.2 7.1 7.2 6.6 5.2 4.8 4.7 4.7

Unique facilities per year, Row percents
One site contributes either no data or incomplete data for years 2004+.

[Index of Tables]


Facilities where mammograms were read

  Exam year
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
  8.0 8.7 8.5 8.2 8.4 7.7 7.8 7.9 7.7 7.3 5.6 4.8 4.8 4.5

Unique facilities per year, Row percents
One site contributes either no data or incomplete data for years 2004+.

[Index of Tables]


Age

  Exam year
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
18-24 0.1 0.1 0.1 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2
25-29 0.4 0.3 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.3 0.3 0.3 0.3
30-34 1.3 1.1 1.3 1.3 1.3 1.3 1.2 1.1 1.0 0.9 0.9 0.8 0.8 0.8
35-39 5.6 5.0 5.4 5.4 5.2 5.0 4.5 4.1 3.8 3.4 3.5 3.3 3.1 3.0
40-44 14.1 14.4 14.8 14.7 14.6 14.4 14.2 13.8 13.6 13.0 12.9 12.4 12.2 12.1
45-49 15.8 15.8 15.9 15.9 15.9 15.8 15.7 15.5 15.5 14.8 14.8 14.6 14.7 14.4
50-54 15.1 16.0 16.1 16.1 16.3 16.7 16.4 16.2 16.0 15.6 15.6 15.4 15.4 15.2
55-59 11.8 11.9 11.9 12.0 12.2 12.4 13.5 14.0 14.2 14.6 14.8 14.7 14.6 14.6
60-64 9.9 9.8 9.4 9.4 9.4 9.6 9.8 10.2 10.5 11.0 11.1 12.0 12.5 13.0
65-69 9.3 9.0 8.5 8.3 8.1 8.0 8.0 8.2 8.3 8.9 8.8 9.1 9.5 9.9
70-74 7.9 7.7 7.4 7.3 7.1 6.9 6.8 6.8 6.7 7.0 6.8 6.9 6.9 6.9
75-79 5.2 5.2 5.2 5.4 5.3 5.2 5.2 5.3 5.3 5.5 5.4 5.4 5.2 5.0
80-84 2.5 2.5 2.5 2.6 2.7 2.8 2.8 3.0 3.0 3.3 3.3 3.3 3.1 3.0
85-89 0.8 0.9 0.9 1.0 1.0 1.0 1.0 1.1 1.1 1.2 1.3 1.3 1.3 1.3
90+ 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.3 0.3 0.3 0.3 0.3 0.3

All exams by year, Column percents among non-missing values -- see Ns for rates of missing
One site contributes either no data or incomplete data for years 2004+.

[Index of Tables]


Race

  Exam year
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
1: White, non-Hispanic 78.2 78.1 78.1 78.4 78.3 77.3 76.5 76.4 75.3 74.8 76.5 75.6 74.5 73.5
2: Black, non-Hispanic 4.6 5.2 5.7 5.9 6.0 6.0 6.2 5.6 4.8 5.6 6.9 7.1 7.6 7.7
3: Asian 3.2 4.3 4.6 4.6 5.0 5.2 5.6 5.7 6.4 7.8 9.3 9.7 10.2 10.7
4: Native Hawaiian or Pacific Islander 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.1 0.1 0.1 0.1 0.1 0.1
5: American Indian or Alaska Native 2.6 2.1 1.4 0.9 0.8 0.8 0.9 1.0 1.1 0.9 0.4 0.4 0.4 0.4
6: Other 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.6 0.6 0.6 0.7
7: Mixed (2+ races) 0.2 0.3 0.4 0.4 0.5 0.6 0.7 0.7 0.9 1.1 1.2 1.2 1.2 1.3
8: Hispanic 10.6 9.5 9.2 9.2 8.9 9.5 9.5 10.1 10.8 9.1 5.0 5.2 5.4 5.7

All exams by year, Column percents among non-missing values -- see Ns for rates of missing
One site contributes either no data or incomplete data for years 2004+.

[Index of Tables]


Body mass index

  Exam year
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
1: 18.5 or less (Underweight) 2.0 1.9 1.9 1.8 1.8 1.8 1.7 1.7 1.8 1.8 1.9 1.9 2.0 2.0
2: 18.5 - 24.9 (Normal) 47.9 47.3 47.3 47.6 46.6 46.6 45.5 45.4 46.8 46.9 45.6 45.8 46.0 45.8
3: 25.0 - 29.9 (Overweight) 30.8 30.6 30.6 30.3 30.4 30.2 30.4 30.4 29.6 29.2 28.8 28.5 28.2 28.1
4: 30.0 - 34.9 (Obese I) 12.9 13.3 13.2 13.2 13.7 13.7 14.1 14.2 13.8 13.5 14.1 13.9 13.9 14.1
5: 35.0 - 39.9 (Obese II) 4.1 4.5 4.5 4.5 4.9 4.9 5.2 5.3 5.1 5.3 5.9 5.9 5.9 6.0
6: 40 or greater (Obese III) 2.2 2.4 2.5 2.6 2.7 2.8 3.0 3.1 3.0 3.3 3.8 3.9 3.9 4.1

All exams by year, Column percents among non-missing values -- see Ns for rates of missing
One site contributes either no data or incomplete data for years 2004+.

[Index of Tables]


Highest level of education completed

  Exam year
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
1: < High school graduate 9.8 9.8 10.0 10.3 9.9 9.4 8.9 8.6 8.5 8.5 8.0 7.7 7.4 7.2
2: High school graduate or GED 27.4 27.2 26.9 26.2 26.0 25.4 25.1 24.8 24.3 23.4 22.3 21.8 21.3 20.6
3: Some college/technical school 28.6 28.1 27.5 27.6 27.5 27.4 27.3 27.2 27.0 26.7 26.5 26.3 25.9 25.9
4: College or post-college graduate 34.3 34.9 35.6 35.9 36.6 37.8 38.6 39.4 40.1 41.4 43.2 44.2 45.4 46.3

All exams by year, Column percents among non-missing values -- see Ns for rates of missing
One site contributes either no data or incomplete data for years 2004+.

[Index of Tables]


Menopause

  Exam year
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
0: No 26.1 27.5 27.9 28.3 28.5 28.3 28.8 28.5 27.9 29.5 29.8 29.3 29.2 28.2
1: Yes 73.9 72.5 72.1 71.7 71.5 71.7 71.2 71.5 72.1 70.5 70.2 70.7 70.8 71.8

All exams by year, Column percents among non-missing values -- see Ns for rates of missing
One site contributes either no data or incomplete data for years 2004+.

[Index of Tables]


Current hormone therapy use

  Exam year
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
0: No 69.8 70.0 68.5 68.7 69.1 70.1 74.0 81.5 84.8 87.4 89.9 90.8 91.5 91.7
1: Yes 30.2 30.0 31.5 31.3 30.9 29.9 26.0 18.5 15.2 12.6 10.1 9.2 8.5 8.3

All exams by year, Column percents among non-missing values -- see Ns for rates of missing
One site contributes either no data or incomplete data for years 2004+.

[Index of Tables]


Previous breast cancer

  Exam year
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
0: No 91.9 91.5 90.6 90.4 90.1 90.4 91.5 91.0 91.0 91.7 92.5 92.4 92.4 92.0
1: Yes 8.1 8.5 9.4 9.6 9.9 9.6 8.5 9.0 9.0 8.3 7.5 7.6 7.6 8.0

All exams by year, Column percents among non-missing values -- see Ns for rates of missing
One site contributes either no data or incomplete data for years 2004+.

[Index of Tables]


Family history of breast cancer

  Exam year
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
0: No 85.2 85.3 85.1 83.8 82.6 85.8 85.4 84.8 84.3 84.2 84.0 83.5 83.1 82.7
1: Yes 14.8 14.7 14.9 16.2 17.4 14.2 14.6 15.2 15.7 15.8 16.0 16.5 16.9 17.3

All exams by year, Column percents among non-missing values -- see Ns for rates of missing
One site contributes either no data or incomplete data for years 2004+.

[Index of Tables]


Ever given birth

  Exam year
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
0: No 17.9 17.2 17.9 18.5 19.7 18.2 18.0 18.0 18.7 19.5 21.3 22.4 23.5 23.5
1: Yes 82.1 82.8 82.1 81.5 80.3 81.8 82.0 82.0 81.3 80.5 78.7 77.6 76.5 76.5

All exams by year, Column percents among non-missing values -- see Ns for rates of missing
One site contributes either no data or incomplete data for years 2004+.

[Index of Tables]


Age at first birth

  Exam year
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
0: Nulliparous 18.3 17.7 18.4 19.0 20.1 18.6 18.4 19.0 18.6 19.2 20.3 20.5 20.9 20.9
1: < 20 10.9 12.6 13.9 14.5 14.5 14.1 14.0 13.5 13.2 13.2 13.0 12.7 12.3 12.1
2: 20-24 20.0 22.7 23.6 24.1 24.0 22.8 22.0 21.4 20.9 21.5 22.0 21.1 20.4 19.9
3: 25-29 10.6 12.3 12.6 13.3 13.2 12.4 12.1 12.0 12.2 13.2 14.0 13.9 13.6 13.5
4: 30-34 3.9 4.6 4.8 5.0 5.1 4.6 4.7 4.7 5.0 5.5 6.0 6.2 6.2 6.4
5: 35-39 1.3 1.4 1.5 1.6 1.6 1.4 1.4 1.5 1.6 1.9 2.0 2.1 2.3 2.3
6: 40+ 0.4 0.4 0.6 0.6 0.6 0.6 0.7 0.7 0.8 1.0 1.2 1.3 1.4 1.5
7: Age only reported as <30 29.6 23.9 20.2 17.7 16.4 20.5 21.2 21.8 21.8 18.1 13.8 14.2 14.4 14.5
8: Age only reported as >=30 5.1 4.4 4.4 4.2 4.5 4.9 5.4 5.4 5.8 6.3 7.6 8.0 8.5 8.8

All exams by year, Column percents among non-missing values -- see Ns for rates of missing
One site contributes either no data or incomplete data for years 2004+.

[Index of Tables]


Age at menarche

  Exam year
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
0: No menarche 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.0 0.1 0.1 0.1 0.1
1: Age only reported as <=10 1.4 2.7 2.9 2.8 2.7 1.6 1.0 1.1 1.2 1.1 1.2 2.0 2.1 2.1
2: <=12 41.6 41.9 42.1 42.1 42.2 42.0 41.9 41.9 41.6 41.8 41.5 40.6 40.5 40.8
3: 13 31.5 30.7 30.5 30.6 30.7 31.5 32.1 32.1 32.3 31.9 32.0 31.9 31.6 31.6
4: 14 13.9 13.5 13.5 13.6 13.4 13.6 13.6 13.5 13.5 13.5 13.6 13.5 13.6 13.5
5: 15+ 11.5 11.1 11.0 10.9 11.0 11.3 11.4 11.4 11.3 11.6 11.7 11.9 12.1 12.0

All exams by year, Column percents among non-missing values -- see Ns for rates of missing
One site contributes either no data or incomplete data for years 2004+.

[Index of Tables]


Covered by Medicare

  Exam year
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
0: No 83.7 79.2 81.3 81.6 81.5 80.5 79.7 78.5 79.0 76.4 75.6 75.2 75.8 75.6
1: Yes 16.3 20.8 18.7 18.4 18.5 19.5 20.3 21.5 21.0 23.6 24.4 24.8 24.2 24.4

All exams by year, Column percents among non-missing values -- see Ns for rates of missing
One site contributes either no data or incomplete data for years 2004+.

[Index of Tables]


Covered by Medicaid

  Exam year
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
0: No 97.7 96.4 96.4 96.3 96.9 97.3 96.8 96.6 96.9 96.2 96.0 96.1 95.9 96.3
1: Yes 2.3 3.6 3.6 3.7 3.1 2.7 3.2 3.4 3.1 3.8 4.0 3.9 4.1 3.7

All exams by year, Column percents among non-missing values -- see Ns for rates of missing
One site contributes either no data or incomplete data for years 2004+.

[Index of Tables]


Covered by private insurance

  Exam year
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
0: No 20.6 34.6 39.0 44.5 45.3 67.4 62.8 62.3 59.8 60.6 65.1 65.8 67.3 63.1
1: Yes 79.4 65.4 61.0 55.5 54.7 32.6 37.2 37.7 40.2 39.4 34.9 34.2 32.7 36.9

All exams by year, Column percents among non-missing values -- see Ns for rates of missing
One site contributes either no data or incomplete data for years 2004+.

[Index of Tables]


Covered by managed care insurance

  Exam year
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
0: No 27.7 41.8 46.1 46.9 45.1 42.7 40.1 44.4 47.0 37.5 29.8 27.8 25.8 24.6
1: Yes 72.3 58.2 53.9 53.1 54.9 57.3 59.9 55.6 53.0 62.5 70.2 72.2 74.2 75.4

All exams by year, Column percents among non-missing values -- see Ns for rates of missing
One site contributes either no data or incomplete data for years 2004+.

[Index of Tables]