Effectiveness of Air Filters in Allergic Rhinitis: A Systematic Review and Meta-Analysis

Figure 2

(a) Forest plot of symptom scores pooled with nighttime symptom scores from the studies by Wood et al., Stillerman et al., Kooistra et al., and Brehler et al. and whole-day symptom scores from the remaining studies. (b) Forest plot of symptom score pooled with daytime symptom scores from the studies by Wood et al., Stillerman et al., Kooistra et al., and Brehler et al. and whole-day symptom scores from the remaining studies.

(a)

(b)