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

Table 3 Risk factors for colorectal neoplasms among the whole group (including control) and the GN group

Variables	Studies	Participants (GN group/control group)	Odds ratio (95%CI)	Heterogeneity
Whole group
Age	6	1735/1956	1.08 (1.00, 1.17); P = 0.04	I2 = 90.13%; P = 0.00
Male	5	1625/1846	2.31 (1.26, 4.22); P = 0.01	I2 = 87.35%; P = 0.00
BMI	3	944/1165	1.04 (0.82,1.32); P = 0.73	I2 = 0.00%; P = 0.44
Smoking	2	237/367	1.16 (0.70, 1.91); P = 0.57	I2 = 0.00%; P = 0.72
Drinking	2	237/367	1.23 (0.79, 1.92); P = 0.97	I2 = 0.00%; P = 0.35
Diabetes	2	293/293	1.16 (0.40, 3.36); P = 0.79	I2 = 76.42%; P = 0.04
GN group
Age	4	933/1063	2.17 (0.91, 5.17); P = 0.08	I2 = 83.37%; P = 0.00
Male	4	933/1063	1.85 (0.88, 3.90); P = 0.10	I2 = 68.71%; P = 0.02
BMI	3	438/568	0.88 (0.80, 0.98); P = 0.02	I2 =0.00%; P = 0.92
Smoking	3	438/568	1.03 (1.01, 1.05); P = 0.02	I2 = 0.00%; P = 0.57
Drinking	2	237/367	1.36 (0.71, 2.62); P = 0.36	I2 = 0.00%; P = 0.79

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