Ciliary beat frequency (CBF) before and after culture at air-liquid interface in subjects with and without PCD.

Measurements were made from high-speed video recordings. In samples with mixed static and dyskinetic cilia, a FFT algorithm was used to calculate mean CBF.$ The data from one Southampton PCD subject was excluded from the analysis because it was an outlier. The cilia of this subject were hyperfrequent and vibrating prior to and following ALI- culture. * = not different compared with Leicester. # = significantly different from Leicester.