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Table 2 Numbers of cases and controls excluded by each requirement (1-8)

From: Family history of venous thromboembolism is a risk factor for venous thromboembolism in combined oral contraceptive users: a nationwide case-control study

  Cases Controls
Start 7,795 2,495,994
(1) Antithrombotic agent within 14 days 2,964 -
(2) Father and mother were not registered in the Multi-Generation Register 971 404,747
(3) Individuals with previously registered diagnoses of any type of VTE 1,560 15,334
(4) Hysterectomy 240 17,362
(4) Bilateral oophorectomy/Unilateral oophorectomy twice 75 3,817
(4) Sterilization 242 29.331
(4) Coronary heart disease/Heart failure/Cerebrovascular disease 191 6,915
(5) Cancer 373 8,957
(6) Infertility 240 37,239
(7) Pregnancy 343 56,043
(8) Women who stopped use of any contraceptives prior to the VTE diagnosis 982 312,099
Unable to match with 5 controls 98 -
Included in the analysis 2,311 11,555
  1. Note that excluded and included patients will not sum up to 7,795 as VTE-cases could be excluded due to several exclusion criteria