Colonoscopy plays an important role in detecting colorectal neoplasms in patients with gastric neoplasms

Table 2 Baseline characteristics of the gastric neoplasm group and the control group

Characteristics	Studies	Patients (GN group/control group)	Odds ratio/mean difference (95%CI)	Heterogeneity
Age	9	2888/3645	0.73 (0.25, 1.21); P = 0.77	I2 = 0.00%; P = 0.00
Sex
Female	10	Reference	Reference	Reference
Male	10	3012/3776	1.01 (0.91, 1.12); P = 0.85	I2 = 0.00%; P = 1.00
BMI	6	2100/2857	-0.38 (-0.73, -0.03); P = 0.03	I2 = 8%; P=0.03
Diabetes	8	2181/2847	1.08 (0.86, 1.34); P = 0.51	I2 = 35.08%; P = 0.15
Hypertension	3	494/494	0.93 (0.68, 1.27); P = 0.64	I2 = 18.56%; P = 0.29
Alcohol	7	1273/1526	0.99 (0.71, 1.38); P = 0.94	I2 = 75.73%; P = 0.00
Smoking	8	1816/2612	1.32 (0.89, 1.95); P = 0.17	I2 = 86.15%; P = 0.00
Colorectal neoplasms
Size	2	807/897	1.69 (0.77, 2.61); P = 0.22	I2 = 33.22%; P = 0.00
Location
Rectum	5	Reference	Reference	Reference
Colon	5	841/915	1.02 (0.59, 1.77); P = 0.94	I2 = 75.16%; P = 0.00
Pathology
Tubular adenoma	4	Reference	Reference	Reference
Tubulovillous/villous adenoma	4	1066/941	0.54 (0.03, 10.69); P = 0.68	I2 = 97.24%; P = 0.00
Serrated adenoma	4	1066/941	0.23 (0.03, 2.03); P = 0.19	I2 = 83.15%; P = 0.00
Adenocarcinoma	4	1066/941	3.15 (0.25, 39.30); P = 0.37	I2 = 71.58%; P = 0.01
Number > 3	2	460/460	1.50 (0.95, 2.36); P = 0.11	I2 = 0.00%; P = 0.08

GN: Gastric neoplasm; BMI: Body mass index; 95%CI: 95% confidence intervals.