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Table 3 Changes in prevalence of wheeze in the last 12 months 2001–2011 stratified by potential modifiers

From: Changes in symptoms of asthma and rhinitis by sensitization status over ten years in a cohort of young Chilean adults

Stratification Category N (%) in 2001 Unadjusted net change % (95 % confidence Interval) Adjusted net change % (95 % confidence Interval)
Gendera Males 143 (26.3) −0.16 (−0.71 to 0.39) −0.27 (−0.81 to 0.27)
Females 184 (28.4) −0.59 (−1.08 to −0.10) −0.48 (−0.96 to −0.004)
Smoking statusb Never smoker 39 (17.6) −0.25 (−0.81 to 0.31) −0.35 (−0.95 to 0.24)
Continuous smoker 115 (36.4) −0.22 (−0.85 to 0.40) −0.22 (−0.83 to 0.39)
New smoker (started after 2001) 9 (26.5) −0.45 (−2.88 to 2.00) −0.58 (−2.95 to 1.79)
Ex-smoker (gave up after 2001) 5 (21.7) −2.00 (−2.91 to −1.02) convergence not achieved
Atopic status (SPT)c Positive 111 (35.1) −0.28 (−1.10 to 0.51) −0.26 (−1.03 to 0.51)
Negative 216 (24.6) −0.43 (−0.84 to −0.02) −0.41 (−0.82 to −0.003)
Methacholine challengec Positive 57 (38.8) −0.48 (−1.57 to 0.62) −0.27 (−1.41 to 0.88)
Negative 270 (25.8) −0.37 (−0.76 to 0.01) −0.39 (−0.76 to −0.01)
Nasal allergies including rhinitis in last 12 monthsc Positive 98 (49.0) −1.90 (−2.96 to −0.84) −1.90 (−3.00 to −0.83)
Negative 229 (23.1) −0.10 (−0.49 to 0.28) −0.10 (−0.46 to 0.28)
  1. aAdjusted model included the confounders smoking, SPT, and methacholine challenge
  2. bAdjusted model included the confounders gender, SPT, and methacholine challenge
  3. cAdjusted model included the confounders gender, and smoking