1. Results of infant lung function testing (Beardsmore 1994).

Measurement*	Baseline		At 1 year
	Prophylaxis	As required	Prophylaxis	As required
TGV (thoracic gas volume)	0.05	0.98	‐0.22	0.09
Gaw (airway conductance)	1.16	0.00	‐1.79	‐1.13
Vmax FRC (maximum flow at functional residual capacity)	‐0.69	‐0.75	‐0.61	‐0.85

*All lung function values expressed as standard error scores