Meta-Analysis
Copyright ©The Author(s) 2023.
World J Gastrointest Surg. Oct 27, 2023; 15(10): 2331-2342
Published online Oct 27, 2023. doi: 10.4240/wjgs.v15.i10.2331
Table 1 Detailed characteristics of the study included in the research
Ref.CountryBariatric surgery1
Control2
Follow-upRisk estimate (95%CI)3
Total
Events
Total
Events
Adams et al[17], 2009United States659625 (0.004)944252 (0.006)12.3HR: 0.7 (0.43-1.15)
Christou et al[20], 2008Canada10352 (0.002)574635 (0.006)5RR: 0.32 (0.076-1.313)
McCawley et al[28], 2009United States14821 (0.0007)349511 (0.003)-
Derogar et al[21], 2013Sweden1509570 (0.005)62016373 (0.006)10
Aravani et al[19], 2018United States3974743 (0.001)9628603237 (0.003)3
Mackenzie et al[27], 2018Sweden/United States879416 (0.002)879435 (0.004)4.6HR: 2.19 (1.21-3.96)a
Khalid et al[24], 2022United States1927266 (0.003)963655 (0.006)5
Kwak et al[23], 2019United States22315 (0.002)22316 (0.002)7.8
Schauer et al[29], 2019United States22198105 (0.005)66427533 (0.008)3.5HR: 0.59 (0.36-0.97)a
Tao et al[15], 2020Denmark/Sweden/Norway/Finland/Iceland49931155 (0.003)4924273158 (0.006)3.1
Bailly et al[16], 2020France74131423 (0.006)97121712629 (0.013)5.7HR: 0.68 (0.6-0.77)a
Tsui et al[31], 2020United States71000340 (0.005)3231971334 (0.004)-
Taube et al[30], 2021Sweden200658 (0.03)203867 (0.03)22.2HR: 0.89 (0.62-1.28)
Aminian et al[18], 2022United States505316 (0.003)2526586 (0.003)6.1
Desai et al[22], 2022United States27914519 (0.0001)739810432276 (0.004)-
Hussan et al[23], 2022United States8863088 (0.001)327734325 (0.001)3HR: 1.02 (0.76-1.37)
Lazzati et al[26], 2022France288604329 (0.0001)8517434434 (0.005)5.7HR: 0.93 (0.79-1.08)
1The crude incidence rate data depicts the occurrence of colorectal cancer over the follow-up duration, denoted as n (%).
2Risk estimation evaluates the likelihood of colorectal cancer onset in obese individuals undergoing bariatric surgery therapy relative to those without such intervention.
3HR: hazard ratio.
aP < 0.05.
Table 2 The quality assessment according to Newcastle-Ottawa Scale of each cohort study
Ref.Selection
Comparability
Outcome
Total score
Representativeness of the exposed cohort
Selection of the non -exposed cohort
Ascertainment of exposure
Demonstration that outcome
Comparability of cohorts
Assessment of outcome
Was follow-up long enough
Adequacy of follow up of cohorts
Christou et al[20], 2008★★★★★★★★8
Adams et al[17], 2009★★★★★★★★★9
McCawley et al[28], 2009★★★★★★★★8
Derogar et al[21], 2013★★★★★★★★8
Aravani et al[19], 2018★★★★★★★★8
Mackenzie et al[27], 2018★★★★★★★7
Kwak et al[25], 2019★★★★★★★★8
Schauer et al[29], 2019★★★★★★★★8
Bailly et al[16], 2020★★★★★★★★8
Tao et al[15], 2020★★★★★★★★8
Tsui et al[31], 2020★★★★★★★★8
Taube et al[30], 2021★★★★★★★★8
Aminian et al[18], 2022★★★★★★★★8
Desai et al[22], 2022★★★★★★★★8
Hussan et al[23], 2022★★★★★★★★8
Khalid et al[24], 2022★★★★★★★★8
Lazzati et al[26], 2022★★★★★★★★8