| Authors | Effective | Double jamb image | Statistical test |
| EL Idrissa, Maroc, 1996 [13] | 82 | 70 (85%) | P = 0.006199 |
| Khanna, Inde, 1999 [25] | 111 | 95 (85.6) | P = 0.002010 |
| DOUCOURÉ, Mali, 1995 [19] | 56 | 9 (16.07%) | P = 0.000000 |
| Diallo, Mali, 2009 [9] | 111 | 70 (63.1) | P = 0.337846 |
| G. Djaré, Mali, 2006 [5] | 67 | 42 (62.7%) | P = 0.374702 |
| A. G. Diarra, Mali, 2009 [14] | 138 | 95 (68.84%) | P = 0.836346 |
| Our study, Mali, 2017 | 54 | 38 (70.37%) |
|