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Table 4 Comparison of outcomes in virus-positive and -negative RTIs

From: Viral respiratory tract infections in young children with cystic fibrosis: a prospective full-year seasonal study

Outcome measures Virus (−) RTI Virus (+) RTI P-value
Number of episodes (n = 20) (n = 44)  
Age at inclusion (months) 7.1 ± 1.4 8.3 ± 0.9 0.4668
Total number of RTI episodes 4.6 ± 0.3 4.3 ± 0.2 0.6037
Respiratory symptom duration (days) 7.8 ± 0.5 8.3 ± 0.5 0.9585
Weight Z-score at inclusion − 1.4 ± 0.3 −1.4 ± 0.2 0.1166
Difference of weight Z-scoresa −0.5 ± 0.2 0.3 ± 0.1 0.5703
Cumulative number of days of antibioticsb 41.1 ± 5 37.8 ± 3.2 0.5646
  1. Results are presented as mean ± SD. Wilcoxon signed rank for paired comparisons
  2. aWeight Z-score at the end of the study period – weight Z-score at the beginning
  3. bOver the year of the study follow-up