Table 2.

Summary of sensitivity and subgroup analysis

Model aspect varied	Base-case scenario	Sensitivity scenarios	Rationale
Unit cost for contact types defined as ‘other’	Unit cost of £0.11, assuming that ‘other’ are undefined administrative tasks	Pooled weighted unit cost of £45.58 based on the recorded resource use for all contacts and associated unit costs excluding ‘other’ tasks	Whether these ‘other’ consultation types are administrative is uncertain
Duration of exacerbation period	1 week	3 days 2 weeks	The average duration of symptoms for an exacerbation is uncertain
Utility decrement values for exacerbation	–0.1 (non-hospital) or –0.2 (hospitalisation) for exacerbation [20]	–0.216 relative to no exacerbation [19]	The utility decrement relative to no exacerbation is uncertain
Type of contacts included	All contacts regardless of whether they are respiratory related	Respiratory-related contacts	Contacts coded as respiratory related are more likely to be affected by the intervention, but a large proportion of contacts could not be coded as respiratory or non-respiratory related
QALY and cost-estimation period	QALYs estimated for 4 months and costs for 1 year post-intervention	QALYs estimated for 4 months and costs for 5 months post-intervention	To assess the shorter term (5 months) cost implications of the intervention
Age of population receiving intervention	Children aged 5–16 years	Children aged <5 years (children aged 4 years)	To assess the cost effectiveness of the intervention for children aged <5 years

QALY quality-adjusted life-year