Table 1 Subjects excluded from the analysis by reason for exclusion and characteristics of those included

From: Vitamin K and childhood cancer: a report from the United Kingdom Childhood Cancer Study

 

Cases

Controls

Total available

2692 (100%)

4864 (100%)

Excluded (%)

162 (6%)a

377 (8%)

 Diagnosed under 3 months of age

56

—

 Down's syndrome

32

3

 Multiple birth

60

108

 Unmatchedb

14

266

Included (%)

2530 (94%)

4487 (92%)

Total included

2530 (100%)

4487 (100%)

Sex (%)

 Males

1413 (56%)

2487 (55%)

 Females

1117 (44%)

2000 (45%)

Age at diagnosis (%)

 <1 year

189 (7%)

351 (8%)

 1 year

254 (10%)

473 (11%)

 2–5 years

1069 (42%)

1926 (43%)

 6+ years

1018 (40%)

1737 (39%)

  1. Three cases diagnosed under 3 months of age also had Down's syndrome, and two cases with Down's syndrome were also part of a multiple birth.
  2. Cases or controls who did not have a corresponding matched case or control after the exclusions had been made.
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