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Table 1 Characteristics of women with specific cancers, identified through the General Practice Research Datalink (2002–2011)

From: The effect of pre-diagnostic vitamin D supplementation on cancer survival in women: a cohort study within the UK Clinical Practice Research Datalink

  Breast Colorectal Lung Gynaecologicala
  N = 11,112 N = 4122 N = 3352 N = 2979
  n % n % n % n %
Supplementation
 None 9952 89.6 3566 86.5 2793 83.3 2687 90.2
 1–2 prescriptions 318 2.9 130 3.2 141 4.2 72 2.4
 3+ prescriptions 842 7.6 426 10.3 418 12.5 220 7.4
Age group
 <60 2019 18.2 324 7.9 249 7.4 484 16.3
 60–64 2213 19.9 441 10.7 438 13.1 586 19.7
 65–69 1888 17.0 564 13.7 516 15.4 557 18.7
 70–74 1427 12.8 648 15.7 628 18.7 514 17.3
 75–79 1339 12.1 761 18.5 651 19.4 360 12.1
 80 and above 2226 20.0 1384 33.6 870 26.0 478 16.1
Period of diagnosis
 2002–03 1809 16.3 587 14.2 453 13.5 438 14.7
 2004–05 2582 23.2 920 22.3 736 22.0 670 22.5
 2006–07 3182 28.6 1175 28.5 981 29.3 841 28.2
 2008–09 3289 29.6 1308 31.7 1067 31.8 951 31.9
 2010–11 250 2.3 132 3.2 115 3.4 79 2.7
Vital status at follow-up
 Alive 9009 81.1 2396 58.1 596 17.8 1828 61.4
 Dead 2103 18.9 1726 41.9 2756 82.2 1151 38.6
Smoking
 Never 6793 61.1 2539 61.6 523 15.6 1936 65.0
 Current 1426 12.8 444 10.8 1399 41.7 308 10.3
 Ex 2559 23.0 1020 24.8 1383 41.3 654 22.0
 Missing 334 3.0 119 2.9 47 1.4 81 2.7
Alcohol
 None/ex 2569 23.1 1081 26.2 984 29.4 716 24.0
 Any 7383 66.4 2533 61.5 1980 59.1 1930 64.8
 Missing 1160 10.4 508 12.3 388 11.6 333 11.2
BMIb
 Underweight 155 1.4 118 2.9 221 6.6 41 1.4
 Normal 3576 32.2 1451 35.2 1314 39.2 788 26.5
 Overweight 3498 31.5 1227 29.8 883 26.3 877 29.4
 Obese 2656 23.9 804 19.5 539 16.1 951 31.9
 Missing 1227 11.0 522 12.7 395 11.8 322 10.8
Deprivation levelc
 Quintile 1 (deprived) 913 8.2 391 9.5 508 15.2 270 9.1
 Quintile 2 1064 9.6 411 10.0 362 10.8 268 9.0
 Quintile 3 1152 10.4 383 9.3 255 7.6 305 10.2
 Quintile 4 1181 10.6 403 9.8 204 6.1 319 10.7
 Quintile 5 (affluent) 1217 11.0 369 9.0 204 6.1 313 10.5
 Missing 5585 50.3 2165 52.5 1819 54.3 1504 50.5
  1. aGynaecological cancers included 1372 women with ovarian cancer, 1599 women with uterine cancer and 8 women with other unspecificed gynaecological cancers
  2. bUnderweight: <18.5 kg/m2; normal weight: 18.5 to <25 kg/m2; overweight 25 to <30 kg/m2; obese > =30 kg/m2
  3. cStudy-specific quintiles of the Index of Multiple Deprivation (IMD) score, based on patient’s address