From: D-dimer for the exclusion of cerebral venous thrombosis: a meta-analysis of low risk patients with isolated headache
CVT
No CVT
D-dimer raised
D-dimer normal
Tardy et al., 2002
6
0
17
Kosinski et al., 2004
20
27
244
Meng et al. 2014
15
1
2
155
Alons et al., 2015
3
63
83
Total
44
92
499