TABLE 2.

Subgroup analysis to assess the total fiber intake and risk of chronic obstructive pulmonary disease.

Sub grouped by	No.	Weighted mean difference (95% CI)	p‐Value	p‐Heterogeneity	I 2 (%)	p‐Between subgroup heterogeneity
Sex
Male	1	0.63(0.49, 0.81)	—	<.001	—	.443
Female	1	0.71(0.60, 0.85)	—	<.001	—
Both	3	0.77(0.65, 0.91)	.46	.003	0%
Follow‐up duration
≥8 years	3	0.68(0.60, 0.77)	.743	<.001	0%	.130
<8 years	2	0.82(0.67, 1.02)	.597	.076	0%
Geographical region
US	2	0.74(0.62, 0.90)	.36	.002	0%	.608
Non‐US	3	0.70(0.61, 0.81)	.35	<.001	3.2%
Adjustment for main confounders
Yes	2	0.68(0.59, 0.79)	.44	<.001	0%	.306
No	3	0.77(0.65, 0.91)	.46	.003	0%