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Thorax 54:103-107 doi:10.1136/thx.54.2.103
  • Original article

Peak flow variation in childhood asthma: correlation with symptoms, airways obstruction, and hyperresponsiveness during long term treatment with inhaled corticosteroids

Table 2

Median within individual Spearman correlation coefficients between various parameters of disease activity in 44 asthmatic children during long term (20 months) treatment with inhaled corticosteroids

Lowest PEF as % of highest (low%high) Amplitude % mean % of symptom free days FEV1 PD20
Lowest PEF as % of highest (low%high) −0.80 (−0.95, −0.38) 0.52 (−0.27, 0.85) 0.33 (−0.50, 0.76) 0.40 (−0.48, 0.97)
Amplitude % mean −0.80 (−0.95, −0.38) −0.39 (−0.88, 0.52) −0.27 (−0.90, 0.54) −0.44 (−0.91, 0.55)
% of symptom free days 0.52 (−0.27, 0.85) −0.39 (−0.88, 0.52) 0.23 (−0.59, 0.84) 0.27 (−0.70, 0.80)
FEV1 0.33 (−0.50, 0.76) −0.27 (−0.90, 0.54) 0.23 (−0.59, 0.84) 0.21 (−0.70, 0.93)
PD20 0.40 (−0.48, 0.97) −0.44 (−0.91, 0.55) 0.27 (−0.70, 0.80) 0.21 (−0.70, 0.93)

  • For each correlation the range (minimum, maximum) of Spearman’s rank correlation coefficients is given.

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