Meta-Analysis: Overweight, Obesity, and Parkinson's Disease

Table 2

Meta-analysis for all groups.

Group	Number of studies	Reference	Model	Type	OR/RR*	95% CI		𝑍	𝑃
A1	3	[18, 21, 22]	Random-effect	Case-control	0.73	0.33	1.61	0.79	0.43
A2	3	[18, 21, 22]	Fixed-effect	Case-control	0.91	0.70	1.17	0.74	0.46
A3	3	[18, 21, 22]	Random-effect	Case-control	0.81	0.47	1.41	0.74	0.46
B1	4	[17, 19, 20, 23]	Random-effect	Cohort study	1.16*	0.67	2.01	0.52	0.60
B2	4	[17, 19, 20, 23]	Random-effect	Cohort study	1.39*	1.04	1.85	2.21	0.03
B3	4	[17, 19, 20, 23]	Random-effect	Cohort study	0.84*	0.61	1.15	1.09	0.28

A1: BMI ≥ 30 versus BMI < 25; A2: 25 ≤ BMI < 30 versus BMI < 25; A3: BMI ≥ 30 versus 25 ≤ BMI < 30; B1: BMI ≥ 30 versus BMI < 25; B2: 25 ≤ BMI < 30 versus BMI < 25; B3: BMI ≥ 30 versus 25 ≤ BMI < 30. BMI indicates body mass index (kg/m²). *indicates RR value, without *indicates OR value.