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Table 2 Level of evidence for studies included in the literature review

From: Timing for deep vein thrombosis chemoprophylaxis in traumatic brain injury: an evidence-based review

Study Prospective Comparison group Level of evidence
CP studies    
Arnold et al. [28] No Yes 3
Cothren et al. [21] Yes No 5
Depew et al. [22] No Yes 4
Dudley et al. [17] No Yes 4
Kim et al. [18] No Yes 4
Kleindienst et al. [23] No No 5
Koehler et al. [19] No Yes 4
Kurtoglu et al. [20] Yes Yes 3
Levy et al. [11] No Yes 3
Minshall et al. [12] No Yes 3
Norwood et al. [24] Yes No 5
Norwood et al. [13] Yes No 5
Norwood et al. [14] Yes No 5
Pahatouridis et al. [25] Yes No 5
Phelan et al. [26] Yes Yes 3
Saadeh et al. [15] No Yes 4
Salottolo et al. [27] No Yes 3
Scudday et al. [29] No Yes 3
Non-CP studies    
Bee et al. [4] No Yes 4
Chang et al. [5] No Yes 3
Park et al. [6] No Yes 3
Phelan [16] Yes Yes 3
Velmahos et al. [7] No Yes 3
  1. CP, chemoprophylaxis.