|
| Study ID | Region | Type of study | Sample size | Nationality | Time Period | Criteria of classification | Age (years) | Gender | Most common age |
| Saudi | Expatriates | Male, N (%) | Female, N (%) |
|
| Albasri et al. 2018 | Madinah | Retrospective hospital-based study (pathology based) | 202 | NR | Jan 2006 to Dec 2017 | NR | 60.1 ± 15 | 139 (68.8%) | 63 (31.2%) | 60–69 |
| Albasri et al. 2019 | Madinah | Retrospective hospital-based study (pathology based) | 1125 | NR | Jan 2006 to Dec 2017 | ICD-10 | 36.9 ± 9.8 | 579 (51.5%) | 546 (48.5%) | 20–49 |
| Alakloby 2005 | King Fahd Hospital, Al-Khobar, eastern province | Prospective hospital-based study | 1676 | 432 (85.5%) | 244 (14.6%) | Aug 2002 to Jul 2003 | ICD | NR | 820 (49%) | 856 (51%) | Adults 1,274 (76%) 13 years, and children 402 (24%) <13 years |
| Ahmed et al. 2016 | Qunfudah region | Retrospective hospital-based study | 792 | NR | Oct 2015 to Sep 2016 | NR | Mean age in females (29.2) and males (31.1) | 342 (43.2%) | 450 (56.8%) | 15–24 (25.1%) |
| Alghanmi et al. 2013 | Jeddah | Retrospective hospital-based study (pathology based) | 360 | | NR | Jan 2005 to Dec 2010 | NR | NR | F > M | F > M | >46 |
| Al-Maghrabi et al. 2004 | Al-Baha, south western region | Retrospective hospital-based study (pathology based) | 193 | 189 (98%) | 4 (2%) | Jan 1990 to Jul 2003 | NR | Mean age 62.2 years | 119 (62%) | 74 (38%) | 60–80 |
| Al-Saeed et al. 2006 | Al-Khobar city, eastern province | Cross-sectional study | 2239 | 1844 (82.4%) | 395 (17.6%) | Jan to Mar 2003 | ICD-10 | 10.49 ± 2.64 | Female schoolchildren | 6–17 |
| Al Shammrie et al. 2017 | Hail region | Retrospective hospital-based study | 13778 | 12,574 (92%) | 1204 (8%) | Jan 2008 to Dec 2014 with missing two years (2010–2011) | NR | NR | 5473 (40%) | 8305 (60%) | NR |
| Alshammari et al. 2018 | Hail region | Retrospective hospital-based study (histopathology based) | 458 | NR | NR | Jan 2014 to Apr 2017 | NR | 34.29 ± 17.5 | 242 (52.8%) | 216 (47.2%) | 30–39 |
| Alshamrani et al. 2019 | Jeddah, western region | Retrospective hospital-based study | 1244 | 809 (65%) | 435 (35%) | January 2017 to December 2017 | ICD-10 | 35 ± 3.8 | 365 (29.3%) | 879 (70.7% | Children 127 (10.2%) (<13 years), adults 982 (78.9%) (13–60 years), and elders 135 (10.9%) (>60 years) |
| Al Shobaili 2010 | Qassim region | Prospective hospital-based study | 3051 | 3051 (100%) | 0 | Mar 2008 to Feb 2009 | NR | 25.3 ± 14.9 | 1786 (58.5%) | 1265 (41.5%) | 5–34 |
| Bahamdan et al. 1995 | Abha, southern region, Saudi Arabia | Prospective hospital-based study | 1223 | 939 (76.8%) | 284 (23.2%) | Mar 1992 to Mar 1993 | ICD-9 | NR | 667 (54.54%) | 556 (45.46%) | Adults 848 (>13 years) and children 375 (30.7%) (<13 years). |
| Parthasaradhi et al. 1998 | Hail region, Saudi Arabia | Prospective hospital-based study | 3298 | 2772 (84.05%) | 526 (15.95%) | Jul 1995 to Jun 1997 | ICD-9 | NR | 1819 (55.16%) | 1479 (44.84%) | Adults 2535 (>13 years) and children 763 (<13 years) |
| Shelleh et al. 2004 | Najran | Retrospective hospital-based study (pathology based) | 1192 | 1003 (84.1%) | 189 (15.9%) | Dec 2000 to Dec 2001 | ICD-9 | NR | 562 (47.1%) | 630 (52.9%) | Children 302 (25.3%) and adults 890 |
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