| Table 1: Reported prevalence rates of factor V Leiden |
| Study | Location | Sample size | Factor V Leiden prevalence, % |
| Beauchamp et al [11] | United Kingdom | 144 | 1.7 |
| Arruda et al [12] | Brazil | 100 | 2 |
| Vandenbroucke et al [13] | The Netherlands | 169 | 3.6 |
| Bertina et al [14] | The Netherlands | 472 | 3 |
| Ridker et al [15] | United States | 704 | 6 |
| Bertina et al [4] | The Netherlands | NS* | 2 |
| Takamiya et al [16] | Japan | 192 | 0 |
| Hakala et al [17] | Finland | 303 | 4 |
| Aschka et al [18] | Germany | 117 | 8.5 |
| Van Bockxmeer et al [19] | Australia | 126 | 4 |
| Emmerich et al [20] | United Kingdom and France | 692 | 4.6 |
| März et al [21] | Germany | 196 | 4.3 |
| Catto et al [22] | United Kingdom | 208 | 6.3 |
| Le Ouerrec et al [23] | France | 300 | 2.7 |
| Present study | Hamilton, Ont. | 356 | 5.3 |
| *NS = not stated. |