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Table 1 Characteristics of studies included in meta-analysis (n = 3)

From: Association between constipation and the development of asthma: a meta-analysis

Study Published year Country No. of subjects Study design Age at enrollment in the study (years) Outcome Measure of association (95% CI) NOS
 Huang et al. [14] 2021 China (Taiwan) 173,720 A real-world, population-based cohort study No age limit Asthma aHR 1.81 (1.74–1.88) 7
 Kiefte-de Jong et al. [18] 2011 Netherlands 4651 A longitudinal birth cohort Newborns Wheezing OR 1.10 (0.96–1.25) 7
 Leander et al. [16] 2009 Sweden 290 A longitudinal population study No age limit Asthma RR 8.24 (3.80–17.83) 6