Table 3.
IBD characteristics among the included studies
| Study | Patients with IBD, n |
Mean age (SD) | Age at diagnosis, years | Male, % | Risk factors, % |
Time to diagnosis, months | ||
|---|---|---|---|---|---|---|---|---|
| UC | CD | smoking | family history | |||||
| Hossain et al. [10] | − | 7 | 32.4 (7.1) | 32.4 (7.1) | 57.1 | 11.4 | 15.0 | − |
| Al-Shamali et al. [13] | 90 | − | 45 | 43.6 | 52.0 | − | − | − |
| Khan et al. [17] | 111 | −- | 36.5 | − | 58.7 | − | − | − |
| Esmat et al. [1] | 135 | 22 | − | CD: 29.7/UC: 27.3 | Male to female ratio 1:1.15 in UC/2.6:1 in CD | − | − | − |
| Alharbi et al. [18] | 394 | − | 30.1 | 30.2 | 51.0 | 7.8 | 7.0 | − |
| Siddique et al. [11] | 182 | − | 36.5 | 28.5 | 50.0 | 14.8 | 14.3 | − |
| Aljebreen et al. [6] | − | 497 | − | 25 | 58.6 | − | − | − |
| Al-Ghamdi et al. [19] | − | 77 | 25.3 | − | 42.9 | − | − | − |
| Al Fadda et al. [2, 20] | 115 | 197 | 25.5 | − | 48.7 | 18.8 | 11.1 | − |
| Abdulla et al. [21] | 123 | 61 | − | CD: 24.13/UC: 28.35/IBD total: 27.03 | CD: 59/UC: 52.85/ IBD total: 54.55 | 7.8 | − | − |
| Abdul-Baki et al. [22] | 16 | 8 | − | CD: 28.8/UC: 32.0 | 48.5 | 25.0 | 26.1 | − |
| Radhakrishnan et al. [12] | 108 | 22 | − | − | 48.0 | 13.9 | − | 13.2 |
| Al-Mofarreh and Al-Mofleh [16] | 238 | 455 | UC: 34/CD: 27 | − | Male to female ratio-1.5:1 in UC/2:1 in CD | − | 9.0 | 6 in 92% |
| Al-Qabandi et al. [24] | 36 | 92 | − | 10.3 | 47 (n = 61) | − | 31.0 | − |
| El Mouzan et al. [14] | 71 | 147 | − | Median ages–UC: 15.00/CD: 16.00 | UC: 41 (n = 29)/ CD: 56 (n = 82) | − | − | − |
| Al Awar et al. [15] | 8 | 3 | − | IBD: 6.5/UC: 4.5/CD: 10 | 4170.0 | − | − | − |
IBD, inflammatory bowel disease; CD, Crohn's disease; UC, ulcerative colitis; SD, standard deviation.