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Table 5 Prevalence of decreased ventilator capacity, possible restrictive pattern, and obstruction as per the raw measures and Z-score (for both 2.5th and 5th percentile limit) of Health CheckPoint Survey, stratified by cluster and sex (in percent within the cluster)

From: Clustering of asthma and related comorbidities and their association with maternal health during pregnancy: evidence from an Australian birth cohort

  Cluster 1   Cluster 2   Cluster 3   Cluster 4  
All (%) Male (%) Female(%) All (%) Male (%) Female(%) All (%) Male (%) Female(%) All (%) Male (%) Female(%)
Raw
 Decreased ventilator capacity FEV1 (L) < LLN (L) 5.25 8.30 0.83 2.72 2.25 3.17 3.51 3.96 3.03 8.86 12.36 4.65
 Possible restrictive pattern FVC (L) < LLN(L) 1.24 1.33 1.11 1.22 1.19 1.25 1.90 0 3.93 1.21 1.84 0.46
 Obstruction FEV1/FVC ratio < LLN (80%) 0 0 0 0 0 0 0 0 0 0 0 0
 Small Airway Impairment MEF (FEF 25–75%) < LLN (L/s) 18.65 21.14 15.04 11.46 11.32 11.60 14.84 10.94 19.03 26.10 32.16 18.80
Z-score
LLN for 2.5th percentile
  FEV1 < -2 z score 4.93 7.75 0.83 0.67 0.64 0.70 1.28 2.48 0 5.08 8.79 0.61
  FVC < −2 z score 0.45 0 1.11 0.35 0.28 0.43 1.07 0 2.21 1.01 1.84 0
  FEV1/FVC ratio < −2 z score 16.95 19.79 12.83 10.19 10.18 10.20 10.57 11.72 9.33 21.65 27.32 14.81
  MEF (FEF 25–75%) < − 2 z score 12.00 14.68 8.12 6.32 6.03 6.59 10.32 9.30 11.41 18.62 24.05 12.08
LLN for 5th percentile
  FEV1 < -1.645 z score 5.25 8.30 0.83 2.72 2.25 3.17 3.51 3.96 3.03 8.86 12.36 4.65
  FVC < −1.645 z score 1.24 1.33 1.11 1.22 1.19 1.25 1.90 0 3.93 1.21 1.84 0.46
  FEV1/FVC ratio < −1.645 z score 22.34 24.27 19.55 17.63 17.38 17.87 18.24 16.63 19.96 33.57 38.35 27.81
  MEF (FEF 25–75%) < − 1.645 z score 18.65 21.14 15.04 11.46 11.32 11.60 14.84 10.94 19.03 26.10 32.16 18.80
  1. Abbreviations: FEF forced expiratory flow, FEV1 forced expiratory volume in 1 s, FVC forced vital capacity, MEF mid expiratory flow (FEF25–75%), LLN lower limit to normal