Table 2

Main outcome variables before and after β-carotene supplementation

	Baseline		12 weeks supplementation
	Supplementation group	Placebo group	Supplementation group	Placebo group	CI of group difference^2-150	Supplementation group	Placebo group	CI of group difference^2-150	p value of the group factor^2-160
FEV₁ (% pred)	72.2 (32.2)	83.7 (21.1)	71.6 (34.0)	82.2 (15.1)	–10.17 to 5.66	70.0 (33.3)	80.3 (19.1)	–9.40 to 7.650	0.696
Antibiotic days/patient	14.5 (14.9)	10.5 (11.2)	9.8 (10.3)	24.8 (19.1)	–35.5 to –2.23	10.5 (9.9)	18.5 (15.8)	–26.73 to 3.07	0.050
Total antioxidative capacity (nmol)	0.85 (0.34)	0.86 (0.26)	0.96 (0.19)	0.87 (0.21)	–0.003 to 0.607	0.93 (0.22)	0.90 (0.19)	–0.204 to 0.346	0.196

↵2-150 95% confidence interval for the group difference of the post/pre differences.
↵2-160 p value of the group factor from the repeated ANOVA model.